Gnostic: cannot cheat to move faster unless you pay.
Incidentally, I've played Sleeping Dogs without ever knowing there is such DLC. I just looked at its DLC page, saw the long list, and said "Fuck that". And you know what? It turned out to be the best GTA-like games I have ever played, even surpassing GTA itself in many areas. And I didn't purchase a single piece of DLC. I'll probably re-buy the complete edition tho, the game's exceptional.
Actually, Metro: Last Light does contain a proper hard mode. What you're talking about here is Ranger Mode, and yeah, I actually preferred to play the original on Ranger. Know what I did? Waited for GOTY, which came in the form of Enhanced Edition. Funny how that works, isn't it? I'd also like to point out that Ranger Mode most definitely is not how the game was meant to be played in any way.
Gnostic: But of you can enjoy games without things like , enjoy the
game without getting the good ending, and
screw you with less content even you paid and same amount of money.
Yes, I'm sure you can find many more gruesome examples of DLC for games you have never played, and have no chance of actually forming an objective opinion on. And I would agree, some of them are bad - especially Capcom is terrible at this. Nonetheless, I've got a very simple rule - as long as DLC is not in any way referenced in-game and the game is not trying to sell it to me via gameplay faults or prompts which would pop-up in any way in-game (Hello, Dragon Age: Origins!), I'm fine with it. There are games which did some weird shit with DLC, like Dead Space 3, and generally, I try to either avoid such games or pay the lowest price tier possible for them.
In the end tho, for vast majority of games, what you get as the base game
is the complete experience and any additional crap is just that - some additional crap. You'll even notice that many games are not even designed with the DLC being there in mind, so your complete edition is going to be inferior by getting tons of items or vehicles you should not have at that point in the game.
You might now ask why am I advocating DLC so much - and my answer would be "because I like the concept." I'm yet to encounter a single piece of DLC which I could not just safely ignore, however I've encountered many pieces of DLC which has enriched my game significantly, either by expanding it in significant way (like the Saxon DLC for King Arthur, adding a new faction, dragons and whatnot, the Disharmony DLC for Endless Space etc.), adding whole new campaigns (DLC for Dishonored) or just allowing me to pick low-price additions that I actually want as opposed to paying for a full expansion pack. DLC is fairly cheap to make, and for an actually creative developer, it opens up space to experiment and try out new ideas in relatively risk-free environment - I can dig that. Sure, there are going to be those who exploit this freedom, as with just about anything in life. But all I need to do is to ignore such instances, and either not purchase entire games if lack of DLC influences them negatively, or just ignore the DLC itself in cases where the base game is sound. I like that developers may now put more work into their popular games, and I do not feel entitled to get their work freely.