I'll have to chime in with Zal and Khato here. Class balance was pretty horrible back then and 40-man raids are very impersonal. I didn't mind the grind though - i don't really care if I spend my time grinding mobs/mats or grinding dailies.

I think having been a boxer back then could have had some fun advantages, but aside from that, I really like what they did with BC and WotLK (minus vehicles) and I'm looking forward to Cataclysm. I like the idea of re-creationg old content instead of just making new. It's a shame that BC is practically empty except for the odd person levelling up - I'd love to see vanilla-territory repopulated :-)