Many do that just to shit on a game they don't like, even if they haven't played it at all. Sometimes though, the complaints can be understood, for example, season pass 1 for Tekken 7. I'm don't really like dlc's even though I know that this is how the game is supported post-launch. Which is ok, but nowadays "full games" are only full after like 10+$ worth of dlc on top of those 60-70$ you pay for the game.