BRINK, which is the only singleplayer game that I find truly fun still.
Seriously someone with FPS shooter experience needs to remake that game
Preferably without ZeniMax over-marketing it.
also single-player, wat. it's just the multiplayer with incompetent bots and a lackluster story that they promised would be "dynamic" but ended up being a bunch of short cutscenes. BRINK in general was disappointing, and I'm willing to bet the over-marketing was preventing Splash Damage from doing what they wanted with the game, and the main reason they released the game in the state it was in.
Luckily, Splash Damage is working on
Extraction, which looks like it'll be a hell of a lot better considering it's F2P.