So I was playing Halo 2 on legendary (Impossible unless you have a decent rang gun or plasmas) with my friend and I noticed that the AI was horrible. One guy on our side was shooting a wall and wouldn't stop. I walked up to an elite and he just stayed crouching until I shot him. Also nothing ever takes cover or really rushes past my cover, all they do is shoot, jump quickly to one side, jump on a box for no FUCKING REASON, look around, and then jump back down. I can't see why people like it's single player so much.