I ended up buying it and so far I'm impressed. The single player is very fun, although I haven't played with any buddies in Co-op mode, I can see it being intense, especially if you turned up the difficulty. I hear they threw in a Zombie level as well once you finish the co-op, that's gotta be pretty funny.
Haven't played much online as I'm getting used to things, but definitey the couple of maps I played were wide open and didn't seem to suffer from the 'Shipment - Spawn and Die' syndrome.
Now I just have to convince my friends to pick it up so we can do some co-op.
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