Grim military shooters. Life's depressing enough, I'd rather be a lovable kid dragon gliding around collecting gems in my spare time thanks.
I really don't need my escapism to consist of, 'hey think your life is bad?! WELL GET A LOAD OF THIS SHIT HOLE, we're goin shooting there boy howdy, and we'll talk to people and see others who will most likely get killed off in really nasty and dramatic ways! Woo hoo! Life is hell!'
I don't hate the shooter genre. Far from it, one of my first influences was Doom and watching my buttfuck-head of a cousin playing it. (I'm a 'ewwcootiesgirl' I wasn't allowed to play it, so I just had to sit there quietly, but I was still very interested in the game, if not the person playing it)
And I can get behind the sci-fi parts of things like Halo and such.
But military shooters are like the bottom of the barrel depressing as far as I can see. Some might get a thrill out of them. I don't see the appeal, the heroics and comradery are lost on me. I know 99% of the players only care about the multiplayer, but usually I'm a single campaign kinda person before I let multiplayer give itself a go, and if I don't like the world aesthetic and background information, I'm not going to get into it, period.