Not necessarily the "best" game you played. For example, I'd consider Spec Ops: The Line a great game, but it sure wasn't a "fun" experience. Anyway, I'll split mine in two.
Single player:
Dark Messiah of Might and Magic. I might be pushing the "this generation" definition here, but it was a 360/PC release in 2006, so it counts. This is one of those games I just never get sick of because the combat is just so good. If you want to see first person melee (mostly) combat done well, look no further. A high chaos playthrough of Dishonored (by the same developer) is also a ton of fun in a similar vein.
Multiplayer:
Chivalry: Medieval Warfare. Just a crazy game. In my 30 hours of play, it would constantly alternate between being edge-of-my-seat intense, and hilariously silly. I've never played anything quite like it in that regard.
And because both of those are very similar, I'm going to throw out a random honourable mention to World in Conflict, a real-time tactical game from 2007 which is basically non-stop explosions with no time to stop and breathe from start to finish.
Single player:
Dark Messiah of Might and Magic. I might be pushing the "this generation" definition here, but it was a 360/PC release in 2006, so it counts. This is one of those games I just never get sick of because the combat is just so good. If you want to see first person melee (mostly) combat done well, look no further. A high chaos playthrough of Dishonored (by the same developer) is also a ton of fun in a similar vein.
Multiplayer:
Chivalry: Medieval Warfare. Just a crazy game. In my 30 hours of play, it would constantly alternate between being edge-of-my-seat intense, and hilariously silly. I've never played anything quite like it in that regard.
And because both of those are very similar, I'm going to throw out a random honourable mention to World in Conflict, a real-time tactical game from 2007 which is basically non-stop explosions with no time to stop and breathe from start to finish.