Playing Halo Reach made me realize I miss the Brutes from Halo 3. I know that's an unpopular opinion, but that game had my favorite campaign(terrible, horrible, no good, very bad Cortana level aside). I say Reach is more consistently good with no outright BAD levels, but New Alexandria aside, nothing great either, or at least on par with Tsavo Highway, The Covenant, or The Ark. The whole campaign has a feeling of waiting around for it to become great, hoping the levels will start to knock you on your ass with the epic scale and whatnot, but besides a couple brief glimpses of brilliance, it never actually does. Feels more like the sequel to ODST, a cheaper-budget spinoff then a full-fledged Halo prequel.
But I guess that's what Halo 4 is for.