People saying 8 tiers is better because of activity decisions, but most of the activity decisions were about people that would be in the top 64 players. So in my opinion 10 tiers is way better: I'm not a great player but ou seemed really competitive to me even with ou3. About activity decisions and people behaving like asses, I think the problem is somewhere else, like leaving so much about rules on activity decisions open to interpretations. I think working on better rules leaving less grey areas as possible is the way to go.