CE's AI remains the best in the series IMO. As Sliding Ghost pointed out, they actually had [i]character[/i] to them. In the second mission when you're in the Warthog and emerge out the "not a natural formation" cave, there's a hill I [i]always[/i] speed over because it gives you a lot of height and the Marines start cheering as you land. A plasma grenade comes their way while on foot, they'll combat roll out the way to avoid being hit. Then when you stick enemies they'll start flailing around trying to pull the grenade off their doomed faces. They'll run blindly into a horde of their own ilk and make the job of cleaning up the latest wave of enemies a bit easier for me. It was truly great stuff. I've played through Halo 4's campaign about 4 times now and in the sections where you are with Marines or Spartan-IVs (both of which are pretty rare anyway), they demonstrate none of the characteristics they did in CE. Nor do the Covenant, and the Promethean-Knights are pretty dull as their cowardly AI takes over and teleports them out of danger, or delivers an overpowered lunge from half a mile away. If there's one major thing I can criticise Halo 4 for, it's that the AI have been very dumbed down.