I've been saying this for years, but Modern Warfare 3 really did me in. Campaign: 3.5 hours, almost no substance whatsoever. Michael bay game in every way.
Honestly? my favorite FPS games this year were Resistance 3 and Bulletstorm, because both had great campaigns (neither of which I spent more than an hour on when it came to multiplayer.) Also, just so everyone knows, Bulletstorm had a surprisingly deep story, but most didn't care because it was buried under a sea of Dick and Fart jokes. If you're willing to give it another shot, do so, and remember that in spite of its immensely immature shell, it's a story about maturity. Remember that.
My Console Library:
PS5, Switch, XSX
PS4, PS3, PS2, PS1, WiiU, Wii, GCN, N64 SNES, XBO, 360
3DS, DS, GBA, Vita, PSP, Android