I freaking loved this game ! Halo had always looked like a good game and last weekend I finally got to try it out at a friends house ! And O-M-G It's such a great game ! Graphics are great for 2001 and the game itself is as well ! The campaign is great with a great story and a great challenge , but I'm sorry I'd rate this game like an 9.1 if it weren't for the outstanding co-op . Playing with a friend is so much fun , Blowing aliens up together , shooting aliens in the face together , beating grunts to death with our snipers together , IT'S ALL GOOOD !!! I especially liked the different weapons and monsters ! I loved being able to ride the banshees and as he called them "Jeeps" together ( I know they're called something else ) . A great game and now that I've finally tried it I'm going to go out and explore the rest of this excellent series !!! This was a great buy , I'd totally recommend this game to you if you haven't played this , It's awesome !!! P.S. I also got to play #2 and it's even better than this one with the ability to be bad guys , have dual wields and some other different enhancements ! : )