Flight sims I guess. I love Star Wars, I love Top Gun, so whether in space fighters or real fighter jets, these should be great fun for me. But I just suck at them so bad it's hopeless. The only one I was ever any good at and really enjoyed was Rogue Squadron 3D for some reason.

Space 4X games. Great concept, but nearly every single 4X game uses the same mechanics, the same type of features, the same mission creep. The mid-late game almost always becomes a grind of churning out the most resources in order to build the most ships in order to conquer the most planets. For once I wish a dev team would take the 4X genre and do something new with it... at least focus more on the mystery and explore component to give the player more options and chances at success/failure.

Any kind of city building sims, like Anno-Series, SimCity, Caesar and the like. Hey, they are fun! but become boring so very soon... Probably I will still pick up Banished at some point because it looks so nice and appealing just to find out that it's so damn boring after a few hours.

Banished it's actually pretty dynamic all-around. You don't have too many "dead moments". I know what i sometimes hate on Caesar and Pharaoh, that you hit a dead spot sometimes, where you don't have enough workers to generate more income, but your city it's not appealing enough for people to move in, so you are pretty much screwed at that point.
In Banished, you can assign each member what to do, so it's easier to move workers to do what you want. But then again, you can hit that spots when people are dying of too many things in the same time, and you can't satisfy all their needs, so you will fail.

Anyway, weird for me to recommend Banished, as i find it much boring and personality-lacking that Pharaoh or Caesar, but you always have something to do in it, so it's more dynamic.

As for the title, 4X space type of games. I was never able to get into Master of Orion and things like that, they seem a little bit too complicated for me. Mostly because i can't really relate to all the currency and materials in those games. I never had a problem playing Civilization just because it's pretty logical, simple, and good UI helps. But with these kind of 4X space games, i am never able to get pass the first hours of play, as i'm like "what the hell am i doing?". I don't think it's so much about how complex they are, but how they are presented. As an example, i was an long EVE Online player. And i think that one it's much easier to get a hang of because you can ignore parts of the game that you don't care about and still improve at playing it. With space games, does not usually works that way, you pretty much need to do them all.

Perhaps you need an rts with a bit more, uhm, oomph! to it then than all of those combined: I think this is the third time today I'm linking it, though if you have hundreds of rts titles then you probably already own it :)

Roguelikes, i have a few of those, i wastch some videos and think "Wow, this looks great, i need to have this" but then when i get the game is more like "I don't know what i'm doing". I know that people won't agree with me but it's better to see some "let's play" before adventuring in one of those since you will get dozens of items with different effects and unless you really have a good memory you will end up forgetting or mixing/confusing things up.

It doesn't help that i feel compelled to finish each game that i play so that i can move to the next one, thing that usually doesn't happen with roguelikes (mostly because i can't even finish them, hell, it has been years and i never finished FTL).

I wish i wouldve liked any sim genre more, the thoughts of neverending gameplay always baffles me. Its like a single player mmo.
But from what ive seen the community is very active. Which led me to wonder..

TBS

have you tried Dark Age of Camelot?

There was an MMO in development acouple years ago called DOMINUS that looked like it was going to be the best MMO ever, but it wasn't mainstream enough, took too long to develop, and they lost funding. SO UPSET about it, still.

I really like that one, but I consider it more of a beat 'em up. I do like beat 'em up games, which is why I think I should be more into fighting games too.

Maybe Action RPGs like Diablo? I'm always kind of attracted to them but I tend to lose interest in them during the first playthrough already and I'm not sure if I ever beat any of them even once, while for others the real fun only begins after that and consists of the endgame or replaying the campaign several times at higher difficulties. I guess I like the graphics, setting and combat mechanics, but I'm not as interested in random grinding and loot all that much ...

I sometimes wish I was more open in general, when I ignore or dismiss other people's recommendation just because of their genres, like sport, sims, strategy, stealth, military shooters etc. ... But I would lie if I said I actually regret not liking those, because I just can't imagine them to be much fun for me, and it's not as if I miss great stories by not playing them, as they're mostly all about gameplay - a gameplay I don't enjoy - so it would seem like a waste of my time if I made an effort to try and get into them.

^ This.

Chalk up another one for RTS games. The mechanics have a lot of potential but a lot of the times, such games tend to degenerate into the same old routine.

Build up base
Tech up
Build tough units
Steam roll enemy
Start next mission
Repeat ad nauseam

Some RTS's split this routine up by only giving you a handful of units to finish a mission, but to me, this isn't enough to break the routine.

I play a mixture of FPS, RTS, RPG and TBS, with a puzzle, fighter, indie or platformer thrown in at random.

I guess my least played genre would be racing or simulator? Racing games have to be flashy for me to care because I have zero interest in cars and more often than not have more fun smashing them up. Most simulators bore me and while I sort of get the "appeal" I don't see how they're an enjoyable waste of time. And no, Goat Simulator doesn't count. I don't care much for overly "look at how wacky I'm being" games.

Otherwise I feel like I give everything a fair chance before I judge it.

Really? Why?