jirachi is absurd. hes the most versatile pokemon in the whole tier by far. typing, ability, stats, movepool, its perfect in every possible way.
garchomp lol. dont know why they brought him back.
kyurem-b kind of just does not fit in OU. you can argue how hes just not fast and has bad typing, but do you see that bulk? its impossible to one shot without something crazy like CB terrakion CC's. also hes a good mixed attacker with no sure fire counters.
things that are banned that should not be:
thundurus-i. priority thunder waves are his only shtick. thundurus-t is superior at sweeping with agility or nasty plot, and still has the speed to get the job done.
blaziken. speed boost isnt good enough to make him uber. its so predictable. also he kills himself because flareblitz, life orb, hazards, and the fact that one HJK miss is gg for him.
I think Drizzletoad should be banned, from personal experience. It sets up the most powerful possible water/electric/flying comboes imaginable, and there's no drawback to using non-water types, unlike Sandstorm and Hail. Furthermore, Politoed has two weaknesses, access to Focus Blast, HP Fire, T.Bolt, Hydropump handling a wide-range of opponents. Removing T.Bolt or focus blast from it's setup is a possible option, too, in lieu of protect in the case of double battles.
Droughttails is barely a threat b/c it's easily phased out by 90% of OU as a whole, and only Exeggutor can abuse it's god-given sun ability. Sand Streamppowdon cripples any of it's non-ground/rock/steel allies.