If you're gonna do the ENTIRE trilogy make sure you DON'T play Halo 2 on Legendary or Heroic stick to Normal VERY bad for your well being in Halo 2 to play on anything higher then Normal
Also if you're using J-Tagged xbox's one of there online code's is NOT the normal code's and if you're seen with one it isn't good for you I don't know the charge's of it but I'm sure you will get fined for it
I mean't for the game itself I chose for them to make the campaign only since we don't need it's multiplayer anymore with new graphics re-mastered audio it would feel more new rather then old like they did for Halo 1 Anniversary