I would have made it a sequel to Halo 3, not Reach.
That means, make it an Arena shooter again where everybody is at the same level and the only variable in each game is skill.
You don't all get to choose different armor abilities, you don't all get to choose different weapons, or perks.
Everybody starts out the same, with the same gun, and the same opportunity to pick up power weapons on the map.
Just like the first 3 Halos. The Halos that were the best Halos. Ever wonder why everybody says Reach is bad? Well Halo 4 took all the bad things and put them in this game and tweaked them slightly.
It's like getting poop smeared all over your face. You hate it, but then a patch comes out that makes poop smell good. Well they just created an illusion to make you think it's not all that bad, but let me tell you. You're still getting poop smeared all over your face.
[Edited on 12.04.2012 3:11 PM PST]