Got it 2 years ago and it ruled.

User Rating: 8.4 | Halo: Combat Evolved PC
This is really old, but still fun. I played for a short while a few days ago and I ruled at it. The graphics were revolutionary at the time but aren't really good today. Still, that was about 5 years ago. Back in 2001. The guns were very creatively made. There is absoloutely no anti-aliasing, which sucks nowadays. The 3D rendering engine is very efficient. This game is also very easy to mod. I created tons of mods for this. Also, the AI was pretty advanced at the time. Most of that is probably scripted but the AI was good.