I think stat leader boards are the worse thing for the server. It drives the community to desperate tactics in order to be at the top. Don't think it will be removed, but I see that as the biggest negative for the server. Guild system at a close 2nd. (not counting the servers inability to handle 3k players)
As for comets comments about the spar leader board. No system is going to determine who the "best" sparrer is, so classic should just make it easier and make it a wins leader board. Might not show who the best is, but it will give a good determination as to who the most active sparers are.