I really like Sherlock Holmes Crimes and Punishments, though I haven't played all of it. Been saving the three last cases for the holiday break, but man that is just an awesome detective game. The deduction-mechanic really makes that game, super fun!
Halo always stood out to me with the way the shooting and the movement feels, it feels tactical in a way I like. I just enjoy it, not a big FPS-fan but Halo just about nails all of it for me personally.