It was a huge game back in 2001, it's still a huge game today 7 years later. How many games can say that?

The only downfall was the graphics, they weren't great and the whole view screen was weird initially. The PC version had pretty terrible graphics, but the Xbox version was not bad.

Nuff said I think. Even if you don't like Halo you can't deny that this game changed the face of gaming forever, and for the better.