I actually loved the stuff with Bill Murray, just because Bill Murray cannot do wrong (shut up, Larger Than Life!), but more so, the animation, the plot (not that great, but its delivery was awesome) and overall villianry of Laurence Fishburne's Thrax character was unique, creative and overall fun.
It was my favorite movie when I was 11 or 12, but in recent years....Yeah, it's still pretty good. A fun time when I need my fix of (fun) animation, gross out humor, Bill Murray or something to watch when nothing else is on.