1.Halo CE:Not only do I love the game for the story and the gameplay that made me a full hearted fanboy of the games,but this on in the series was not only the best,but I have many strong memories playing this game and its also the game that got me into gaming.
2.Diablo II:Ok,I will admit,i just got the game 3rd quarter last year,but the game sucked me in and im loving every second of it.Plus using only the mouse for combat is so peaceful.
3.Mass Effect 1 and 2:Yes I know they are to different games,but I love them both equaly so I cant choose which one is better.Fun gameplay,great scifi story, and fully voiced.I mean,whats not to love about these games!?