I liked the first and second Monkey Island games the most... because I never bothered with any other due to the changed art style which I didn't liked at all. :> This is also why I didn't liked the remakes (well, and the obvious gamepad focus they had, plus you couldn't skip dialog anymore if I remember right... horrible, stupid changes)
Also the Indiana Jones games. I played Fate of Atlantis so, so, so often.