I really, REALLY want Just Cause after playing the demo! Even Saints Row got good reviews.... I haven't managed to get Dead Rising, Saints Row OR Just Cause yet! Argh!
Doom XBLA is good, whoever asked! It's essentially the same as the CE Xbox version, but looks slightly crisper (try the demo) and yeah, the Live play is pretty sweet. I'd say if yr a big Doom fan then its worth a few quid to get good Live play from it.