For a couple years, I was part of the leading PvE progression guild on Aggramar. (Yes, this is World of Warcraft stuff.) We got most of the server-first kills -- I think we were beat to only two or three in the time I was with them. Not that it was an extraordinarily competitive server, but for a casual guild with a relatively short raiding schedule, it felt like we were doing pretty well.
When Sunwell was released, I retired from raiding for a while, and eventually took a break from the game altogether. That was about two years ago.