I guess.....Halo 1>Halo 3>Halo 2>Halo Reach. I haven't beat the game yet but I'm close to it. All the Friendly A.Is are retarded, I am impressed with the enemy AIs, and a few things still seemed like they need to be polished. Which is why they should release this game with a good editing kit or give Halo PC owners access with this engine (like UDK or Crytek). I highly doubt that will happen though, and that's not even close to a good excuse.