Have to mention three, and w/reference to my most influential gaming experiences.
1. Halo CE started this whole video game thing for me.
2. The ME series is easily my favorite series, w/ME3 my fav of the trilogy.
3. I've played more hours of Diablo 3 than any other game far and away. There's a reason. The progression is so addictive and the game just keeps improving w/every update.