I remember when the game came out, my friends and me played this every night for three weeks. Haven't touched it since. Hopefully the new DLC will extend the replayability of it.
To date I have not been able to get the 'cr0wnd' achievement. Many a night I've spent trying to get it, but gave up long back.
Oh and in versus mode, becoming a fat zombie who pukes is the best. Great lulz were had when we wiped the entire team in a few seconds with perfectly timed attacks