MMO's because I have a shitty internet service provider :( plus I don't have the time.

I never really understood the meaning of sports games (exception made for Racing ones).
I don't find sports fun in "real life" (despite believing that everyone should exercise each day, but then again, that is not a sport), let alone in virtual reality.

Also, I don't play MMOs. Awful providers aside, many feel like a chore. I cannot suffer games with grinding and FedEx quests, and in MMOs that is basically all there is to do.
I know that some can be very interesting and entertaining (I'm thinking about War Thunder, for example), yet I neither want to waste a massive amount of time gathering what I need for upgrades nor I want to buy a premium account.

There are also games I have never played for no apparent reason. For example, I always wanted to try a space sim, yet I simply never did.

I'm pretty horrible with a controller and any game really :P Fighting games especially, but fear me when I'm playing as Reptile in MK4 with my right hand over the arrow keys and my left hand over Shift,Ctrl,Space,Z,X,C,V >:-)

For me: Puzzle games, Platformers... And the worst of all : Platformer Puzzle games !

I suck at them and find them tiring and unfun... So, I prefer to avoid them :)

Strategy sim games, too much like a real job. Wall of text and info, tiny squiggles of graphics, cluttered interfaces. Headache inducing.

Platformers. hate em. hate to repeat over and over certain keystrokes till I get it right in order to progress the story. left left jump right left right right duck left left run run run duck . ok. great. next part left.. DIE. repeat entire process again. ugh

Games with checkpoints instead of free saves. see above. not really a genre but what the hey, im in grumble mode

Games with 3d view, this is tricky, some i can play no problem, some like Portal I'll be hugging the toilet in half an hr.

Racing games, I just drive into the sides a lot :(

Also strategy games, but this is mainly due to lack of commitment to getting through the tutorials etc. and learning how to play.

Stealth games. I can manage games like the Batman: Arkham games because there is a bit of forgiveness to the stealth (and you're given a lot of ways to be stealthy) but games like the Splinter Cell games are a major no go for me. I honestly don't have the patience to spend ten minutes sitting in one spot looking for the one single "correct" route to get through a room, just to get to another room and repeat the cycle until the game is over, especially as many of them have a "if one person maybe sorta kinda senses you then you go right back to the beginning of the level" mechanic.

Twitchy Puzzle Platformers. You know, Super Meat Boy, They Bleed Pixel etc type games that require you to die fifty times to figure out how to get through the level. I actually enjoy some of them a bit but I just completely suck at most of them (though I'm sure getting a controller would help immensely) once I get past the first ten to fifteen levels, and this genre is probably the most likely (besides stealth games) to make me "rage quit" and whine about the game being too hard.

Edit: More of a "refuse to play" than "can't play", but MMOs/multiplayer only games.

For me sport games and MMOs are just boring.

Are your instructions valid for all Civilization difficulty levels, from Chieftain to Emperor?

In the Civilization game I was playing, after creating the capital, I was supposed to move the militia units that the city started producing around the gaming world, exploring it. Sometimes I bump into a house icon which either is some valuables, or releases a horde of barbarians at my militia unit.

Occasionally I bump into another city and meet an emissary, who asks if I want to be friends or foes with them. If I say friends, then it gives me yet more options like "yeah let's be friends, happy happy joy joy" or "I have a military proposal" or "Gimme a tribute, or else". Which should I choose, or does it matter at all, I'll win the game anyway?

Then, sometimes different things just happen semi-randomnly, that seem completely meaningless. For instance, suddenly my citizens want to build something extra to my temple? Uh, ok, go ahead, fine by me. Select which part they should decorate in your temple. Errr, I couldn't care less. Does it matter which one? Is this somehow relevant to the rest of the game at all?

What's my objective in the game anyway, besides letting citizens decorate my temple? When will the game end? I don't think it gave me any actual objectives. This is what I meant by just throwing me into a game with a "there's the world, do something and try to win (something)". It's all rather confusing, which actions and happenings are somehow relevant and which are just useless fluff. It is like those costume mini-games in some GTA clones (e.g. Saints Row 2), do they have any relevance to the rest of the game? If not, I'd rather not waste my valuable time on buying and trying out different costumes. If I want to play with paper dolls, I'll buy a paper doll game.

I guess I like classic RTS games more because they are more focused and give understandable objectives, what I am supposed to achieve in order to win the scenario/mission. Also. they slowly introduce you to the game, first giving simple tasks for the early missions, and step by step making it harder. "In order to win this scenario: train five peasants and make them build three farms.". Ok, clear enough, will do. I don't need to read a thick manual to understand that.

Those games like Super Meat Boy, either you play for hours (weeks? months? year?) until you're able to finish it or it is just pointless to play them.

Not a genre but games that have oversexualized little girls, i loved the Etrian Odyssey 4 demo but the artstyle is terrible and somehow i know that i will enter in some obscure list if i buy that...

Open world and RTS games.

RTS end up boring me... and open world games just get tedious because I'm a god damn completionist x_x

I think you summed it up pretty nicely, i bolded the important parts. That's the feeling that creeps also to me with all kinds of business and empire simulations. The only reason I'd like to manage a restaurant, or play with stocks, was that I would get paid for it. Seems almost as pointless as a lottery simulation. Heck, I even recall slot machine "simulators" from my childhood. I never understood why would I want to play a simulated slot machine, without even being able to win money from it for real? Woohoo, a jackpot, I won one million in funny money!

Mine are the graphical adventure games. The game has to be awesome and if it's an horror one that's a plus, otherwise is difficult for me to play it more than 30 min.

I have some kind of retail Civilization collection I bought many years ago. I think it includes all Civilization main games from 1 to 4, if I recall correctly (not some Civ spin-offs like Call to Power, but those I have as well). I think it is the "Civilization Chronicles (2006)".

Yeah, maybe I should just accept that at least the first Civilization game will never make much sense to me, and maybe the later games are more sanely constructed.

Can't tolerate any of these:

4X Games
Sports Games (realistic racing games excluded)
Grand Strategy
MOBAS
Anime/Manga

I don't have much preference towards graphics fidelity but the above games are totally off my list, sometimes I may make an exception to a game or two but mostly it's a big no.