I'm looking for something that is Co-op and fun. I looked into the BG:Dark Alliance series but they're 99% tedious dungeon crawl and 1% reward. I looked into the X-men Legends games but they appear to be only slightly better than BG. Marvel Ultimate Alliance looked pretty neat.
Along the same lines, how about Champions of Norrath and Champions: Return to Arms? The first game was rated pretty highly upon release - it's a dungeon crawler, but a really good one.