the ubers that were brought down definitely were better than most ou pokemon, but i wouldn't call any one of them "broken". i only used excadrill the whole time, and while it's certainly a powerful and threatening sweeper, i think every single opponent i faced had either a techniloom, hippowdon, landorus-t, or some combination of those three to deal with exca pretty handily. thought about pairing it with gothitelle, but there was never any room. also i know there was a ton of hype about iron head, but i didn't find it super useful. steel is a crappy offensive type. as for thundurus, which i faced once (finals), it's really not nearly as scary as it used to be, what with the extremely fast-paced metagame of today's bw2 ou. scarfed revenge killers are everywhere, and all are strong enough to remove thundy from play permanently, so sweeping is tough to do. leftiez used a utility attacker set with thunder, hp ice, focus blast, and twave, which i thought was interesting because it really fit in with the rest of his team, which were mostly slow, bulky boosting sweepers. last but not least, blaziken is the one i feel is the only potential pokemon in this trio that's still justified being uber. speed boost racks up really quick, and with all the choiced mons in this metagame it's really easy to set up a swords dance on something like hp ice-locked keldeo and pull off an easy sweep due to hi jump kick's absurd power level. and once it's at +2 basically nothing revenge kills it, plus it's not even weak to any common priority attacks (aqua jet doesn't count as common in my book). if i were solely in charge of the ou tier right now, i'd say test unban excadrill and thundurus.
AND I FORGOT THE LOG AGAIN
edit: my name isn't john