Everything from the campaign to multiplayer to forge mode is amazing. It's absolutely one of my favorite shooters of all time. Graphics are amazing. Audio is sublime. It captures all the fun and magic of the original Halo CE without ever tiring out. i don't miss the brutes or the flood (never really liked them anyways) and the Prometheans add a great challenge to the gameplay. The only thing i would say is missing is the firefight mode. i loved playing it both alone and co-op offline but for some reason 343 decided to replace it with the Spartan Ops multiplayer side story missions... which would be fine if it didn't need to take up 2 gigabytes of space on my hard drive to store something i can only access online... which i would be fine with if i had internet.  But that problem pales in comparison to how absolutely amazing every other aspect of the game is.