Sega Genesis > SNES
Single Player > Multi Player. If your game has no redeeming single player value, than it is garbage. No excuse for an 8-10 hour campaign if I'm buying it new for $60.
Final Fantasy X was the best FF game.
Skyrim > Dark Souls
Bioshock was a fine game, I enjoy it.
Mass Effect sucks. All of them.
So does Halo.
Time Splitters is the best FPS multiplayer game on the previous gen consoles (PS2, XBOX, GC).
CoD's campaign is generic, there is absolutely nothing special about it.
GTA 4 was a great game.