Halo 2: No sense of satisfaction while playing, terrible story, requires no skill on-line. The game is utterly geared for starters, newbies. HL2: Not even close to the original. Hardly any variation in the gameplay, although environments change. Few enemies. Not intense or fun. Doom 3: Extremely engaging, fresh, and fun. Environment doesnt change much, but the gameplay varies a lot. Many enemies and weapons. Music fits perfectly with environment. Requires a lot of skill and speed to win. Result: Doom 3 is by far the best. What d'yall think abt it. Voice ur opinions..