I haven't been on XBL with it, it seems to have lots of support from the online crowd on xbox.com.
The graphics are, honestly, disappointing.
Single player mode is fun and challenging. I've been playing several days and am thoroughly enjoying it. I think I have 14 hours total racked up (it keeps track) and countless lives lost, and apparently I'm only about halfway through the campaign.
It was worth the $35 I paid for it at BB.