Something that jumped out at me from the 1up review was that they were saying that it doesn't do a whole lot of new stuff (not saying that it's not great), but the thing that came out the most in that review was when they talked about online co-op and lag.
"The only drawback is every co-op game we've played over Xbox Live, whether it's two, three, or four players, has been fairly-to-incredibly laggy."
Seeing as the online co-op was a big factor with this game, I find this to be interesting.