Yeah Halo 2 was a major dissapointment. They went in 10 different directions all at onece in that game. The campaign on legendary lavel is hard beyond belief. It's so hard in fact that it's close to impossible, there's no logic to it, just one hit and your dead.
Everytime you settle into the game it changes sides to the Arbiter. You get settled into the Arbiter and you're back to the Master Cheif. Very irritating. The way i like to explain it Halo 2 is, thay took all the icing from Halo 1 and made it the cake in Halo 2. SO basically the game is all about glits and glamour with little substance. What a dissapoinment.