Thundurus, Garchomp, Manaphy, Excadrill, and non-BP Blaziken all did fine in DW, which this metagame is starting to resemble, so they'll all need serious review here at some point. Unfortunately, inept procedures are keeping this from happening anytime soon; hopefully things will all work out time without the delay causing any lasting issues. But then, this is Smogon, so that's not likely.
Exactly. As a player of DW OU (at least in the days of PO), I agree completely with you, and I consider it very odd that these "broken pokemon" weren't even centralized in DW OU, for example, thundurus had less usage then tornadus, and sat at a low #60 ,iirc, in usage. The only thing I saw with any consistency, was garchomp, sitting at #8, right behind dragonite. I know I'll have people screaming at me for even suggesting this, but if we have to, I'd even be ok with ability bans for sand veil garchomp and speed boost blaziken, if we're ok with banning soul dew on the lati's, why are we so against this?
Edit: found the actual May stats: Thundurus #60, Garchomp #8, Manaphy #37, Excadrill #15.
Just for reference, the top ten, in order, are: Tyranitar, Chandelure, Genesect, Brelooom, Politoed, Ferrothorn, Dragonite, Garchomp, Ninetails, Infernape. With usage ranging from 15.3%,to 10.6%.
Meanwhile regular OU's were: Scizor, Dragonite, Rotom-W, Heatran, Tyranitar, Ferrothorn, Terrakion, Politoed, Gliscor, Jirachi. With usage ranging from 27.2% to 14.2%
If anything, DW OU was less centralized, likely due to it's increased variety.