You don't need someone else telling you its cool.
So instead, here are the few criticisms I have.
1) Lack of variety in the weapons. Guns or sword, yawn. Add in ninja weapons, chainsaws, buzz-saws, tazers, lazers, and fantasy weapons like... you ever play Perfect Dark? Something like the Reaper in that. Crank up the cool factor with more weapons.
2) More protagonists? The guys in the jeep who toss Hank the sword, well, what about 3 guys going apeshit on agents instead of just 1. The teamwork and the killing and the combos of death could be turned up to INSANE with 3 guys at once. And of course with 3 protagonists, you'd have to have a saviour with all-new-and-improved Jesus powers, and an even more OMFG clown. One guy is getting boring.
3) More interesting battlefields. They're all flat, save for the occasional vending machine or table. Put some funky shit to use in them. Say it was set in a factory, there are TONS of ways to kill people with the machinery there. Fight on a conveyer belt anyone? With objects going down it?
Ok, I'm done. (still voting 5. Holy fuck)