Bayonetta
Everything about this game was fantastic.. the music, visuals, character and level design. The only real downside is that there wasn't more of it.
Completely nuts.. off the wall and fantastically fun to play.
Got the whole 1000gs on this and it took some doing!
Need For Speed: Hot Pursuit
Surprisingly fun arcade style racer.. brilliant visually and the feeling of pace is second to none imo. Its a game you could just turn on a play for a few mins and come back at a later time. Replayablity was maximized by the autolog which allowed you to try to beat your friends times and wind them up lol.
Call of Duty: Modern Warfare
As already mentioned.. this for me is probably the pinnacle of this generation as far as both SP and MP gaming is concerned. Some of the missions were simply jaw dropping! From the Nuke mission to the Ferris Wheel mission.. this game is a must play!
Veteran leading to Mile High is one of the biggest "highs" I've had from a game.
Honourable mention: COD:MW2 Spec ops - tremendous addition that really changed the way I approached the missions second time round..
Mass Effect 2
I thought ME1 couldn't be beaten by the sequel.. I was wrong!
Everything from the graphics to the control system was massively improved upon.. A game that I couldn't put down till it was done.. and even them when I knew I was coming to the end of it I still explored and bought DLC to expand the life of the game.
Dead Space
I was really torn as to what to pick for number 5.. but then I remembered all the stand out components that made DS the awesome game that it is.
No other game will make you feel so alone and vulnerable.. and I don't think there will ever be a game that will effect the user as prominently as this.
The standout for me is the sound.. Everything makes you wonder what is about to happen.. and makes you doubt turning that corner. A must play!
Honorable mentions: F12010, Forza 3, Batman AA, Portal 1/2, Crysis 2, GOW2, RDR and Street Fighter 4.
Phew.. I loved posting that