Impossible to say. Changes in graphics, power of the computers, many things will make newer games look and feel better than older games, but I have fond memories of several games.
Original Halo was fun, Half Life was incredible, Deus Ex was truly unique when it came out. X-wing Squadron and Crimson Skies were fun flying games.
Romance of the Three Kingdoms and other simple games on the original NES were great at the time. Diablo type games were fun. I played the hell out of D2 and Path of Exile.
Today I have enjoyed the Fallout series, Skyrim other FPS types.
Currently I am playing a simple game called Realm Grinder. It's just a time waster, but I like it.