Is there really a point to all that, though? And honestly, I could see it spawning absurd debates... "I've seen 5 Forretress in the last week, it should be lower OU!" "Well I've seen 7, so it's middle OU!".
The one thing I could potentially agree to a simple tier between OU and uber - for things like Deoxys-E, Manaphy, Tyranitar, Celebi, Blissey, Salamence... and work from there. Granted, to actually use it, you'd have to do some of the weird shit we're doing right now, but we can leave that up to the tournament runners, not the main site.