I said halo reach had the best campaign. Such a sad campaign... I really disliked playing all the other campaigns on the other halos (I'm the type of guy who HAAAAAAAAAAAAAAATES playing campaigns, so its not halo's fault as to why i hate playing their campaign, its just that i'm a multiplayer-loving A**hole) but reach really took the cake on the campaign, despite reach's crappy multiplayer. I was NOT expecting noble 6 to die and for reach to die, at the end i was like, "whoa... wahh... ;^( you're a hero, noble 6...
Campaign really doesn't matter to me, anyways, I just love the cutscenes and the story as a whole. I'm more focused on the multiplayer, which halo 4 has succeeded on.