in my eyes the line of questioning should shift away from whether or not tornadus-t is broken (it is, unquestionably), and towards whether or not its healthy.
I voted UU, and you guys will see my reasoning soon enough, but i think there's overall a disturbing lack of discussion about the torn-t meta, and whether or not it's an enjoyable meta to play.
biased calcs aside, there really are plenty of checks and counters to torn-t - it really should be running taunt in that fourth slot. It's essentially no different from Victini at the minute - yes, it can run mixed LO sets and special sets that render its normal switch-ins vulnerable, but that doesn't mean you shouldn't switch in swampert/slowbro just because there's the risk of specs grass knot.
i realize that my view is incredibly obtuse and somewhat unprecedented, but i'll sort of summarize it here.
it's not a problem if fifty percent of teams use tornadus-t because it's so good, because its ability as an amazing pivot makes it healthy for the metagame as a whole and it ends up being an equal advantage. it's not like raptor or crawdaunt, who promote an unhealthy, spam-powerful-move meta that is unfun and lacks diversity.
I think the fact that torn-t almost singlehandedly makes stall, bulky offense, and HO more viable is important and that we might consider overlooking its brokenness and really consider its effects on the metagame
or I might be batshit
Just going to reply to this so we can get some more current meta discussion ^_^
'There are plenty of checks and counters', yes I can agree to this, there are counters to certain Tornadus-T sets but let's break it down.
Mega-Aggron- No, reliable recovery unless you have rest but that sucks, so Torn can come in and chip that thing right the way down.
Suicune - Gets Knocked Off, U-Turns out, Torn has gotten a free 30% damage on Cune at the loss of no health
Slowbro - Removes an item, maybe Rocky Helmet so it inflicts a bit of damage on itself, U-turns out, Torn is back at full, Slowbro has become easier to deal with for something like Victini which doesn't need to worry about Rocky Helmet recoil.
Mega-Aerodactyl - Weak to SR, pretty simple predict to make, Torn U-turns, Aero is on the backfoot now and Torn is still chillin at full.
Hippowdon - Same scenario as all the others, loses it's item, u turn out, free damage and you guessed it, Torn is chillin back at high health.
etc etc etc What can counter it, is so god damn obvious that Torn just clicks U-turn and gets the fuck outta dodge. For everything else, Knock Off + U-turn is basically all you need cause at the end of the day, Torn might not be killing anything but it sure as hell isn't getting killed itself.
I think it is a problem if 50% of teams are containing Tornadus-T cause that leads to an insanely stale metagame. As it is, the prominence of ABC pink wall already makes UU boring IMO and I for one think Torn adds to the 'let's make everything live forever' aspect of UU, which for Stall players, sure is great fun for them, but makes it incredibly hard for other playstyles to do well when so much is so bulky already as it is. Being able to kill something isn't the only thing that makes a metagame 'unhealthy', Victini spams strong moves, Chandy spams strong moves, Hydreigon spams strong moves, without the addition of these wallbreakers, the meta becomes so heavily weighted to defensive play that it creates a more stale meta than one containing a good mixture of walls, wallbreakers, sweepers etc.
Also, increasing viability doesn't really have much to do with whether a Pokemon is balanced or not, whether a Pokemon is balanced or not weighs on it's impact that it has on a metagame. If i'm seeing Torn's every second battle and seeing 1v1 Torn battles at the end of game in my eyes makes me think maybe, just maybe, Torn might be a little too good for the metagame.
Gonna reply to effyouzion while i'm at it. Deoxys-Defense and Shuckle are 2 Pokemon being suspected as we speak. Do either of them kill Pokemon or 'spam a move' and win the tier. No, they set up hazards, they're not killing shit, but what they do in the meta is make it extremely overcentralising to the point where many teams in RU and OU auto lose to strategies known as 'Shuckle Web' and 'DeoSharp' respectively. So the argument that, 'it's not broken cause it doesn't kill mons hur hur' is completely retarded. Pokemon are broken on the preface that was they do is deemed either, too good (or their ability to do what they do so incredibly well, which spoiler: Torn-T is guilty of) or causes such a drastic shift in the metagame just to deal with their presence happens. Have you seen an Alakazam lately? Infernape? I sure as hell haven't and I have a sneaking suspicion that has something to do with the addition of Regenerator Bird. Torn-T makes so many extremely good mons unviable and if that isn't what you consider broken well then, i dunno what is.