I personally think we're getting a little ban-happy in our suspect tests. I don't think either of these two Pokemon are anywhere near broken (I didn't think Genesect was broken either, but we're not going debate that here, obviously). I don't think anyone here has yet to put a definitive reason WHY either of them should be banned so far (or at least what I think should be an acceptable argument). I personally think these are both two excellent Pokemon, but I think we need to learn the difference between a broken Pokemon and merely a very good one. Let's look at them in more detail (Just Torn-T for now):
Tornadus-T
So far, after what I've experienced, I'm probably leaning about 25 : 75 ratio of Uber : OU. Yes, Tornadus-T is an excellent Pokemon. Yes, it is very hard to deal with. STAB Hurricane is excellent, it is ridiculously fast, and it has U-turn. However, none of these point to a broken Pokemon. I know we dispensed with the old "characteristics", but they are still useful to judge a Pokemon's strength. In my opinion, Tornadus-T does not fit either the offensive, defensive or support characteristics. It cannot sweep teams with little to no support (Firstly, it needs Rain, secondly, powerful as it may be, it cannot OHKO half the metagame without hazard support, thirdly, it's still relatively easy to revenge kill). I'm not even going to bother with the defensive characteristic. That leaves support, and while yes, Tornadus-T is pretty good at softening up or killing things, it doesn't really support the team in really significant ways. It can't set up hazards with no effort at all (Deoxys-S), it can't break specialised walls that may allow other Pokemon to sweep (eg Jirachi, Chansey) and it can't Baton Pass a ridiculous set of boosts (DPP Mew). Plus, Tornadus-T has very solid counters in OU, we don't have to go look down the trash pile to find hard counters. Jirachi, Chansey, Metagross, specially defensive Rotom-W in OU at the very least counter it in pretty much every sense of the word "counter". If we're willing to go down to lower tiers, we can find Zapdos and Raikou, both of which have niches in OU. After that, we can go to his checks, which gets ridiculously bloated. Most good Scarfers easily stops Tornadus-T. Salamence, Garchomp, Kyurem-B, Heatran, Rotom-W, even Politoed can kill Tornadus-T without much problems at all. We also have Jolteon and Weavile which both naturally outspeed Tornadus-T and can OHKO it with their STAB attacks (Jolteon is severely underrated and Weavile is getting increased utility with all the Dragons, Gengar, Starmie and genies running around). Mamoswine also puts it out of commission easily. You may think Regenerator "nullifies Stealth Rock", but you have to remember that with it up, you're facing Tornadus-T with 75%, not 100, which makes revenge killing it much easier. On a similar topic, Tornadus-T, while bulkier than Tornadus-I, isn't exactly bulky. It has Regenerator, but it's not something you can switch into like half the metagame and still pose a huge threat to (hi Garchomp). Another thing is that the metagame has become faster and more offensive, while being bulkier. Tornadus-T can kill less things as easily while being easier to be killed. So what can Tornadus-T do that makes it that broken? I can't really see it. Let's just compare him to the other Pokemon we've banned in Gen 5 so far and see how Tornadus-T fares:
Deoxys-N / Deoxys-A: Practically NOTHING can switch into these two things, 150 Speed and 150 (180) Atk / SpA completely shits on 121 / 110. Deo-A was able to do shit like 2HKO Scizor with Psycho Boost and ExtremeSpeed, 2HKO bulky Steels (their "counters"). Destroyed most of the metagame
with one set.
Darkrai: Faster than Tornadus-T, has an accurate Sleep move, access to a boosting move (Nasty Plot), and boasts similar coverage. Single-handedly demolishes most stall teams. Unlike Tornadus-T, it could completely incapacitate potential counters without needing another Pokemon's support. Destroyed most of the metagame
with one set.
Shaymin-S: Even faster than Darkrai, has flinch hax, higher Special Attack and a STAB move that -2's your Special Defense 80% of the time. Also has Leech Seed and a STAB that fucks up all Leech Seed immunes. Also has a boosting move in the sun in Growth. Makes Tornadus-T look like a joke.
Swift Swim / Drizzle: Kingdra / Kabutops / Ludicolo / Qwilfish / Omastar were all threats in the rain that makes Tornadus-T look like Politoed when compared to Kyogre.
Blaziken: Very difficult to revenge kill, pretty much nothing could stand up to its high power STABs (apart from like... Slowbro/king). Swept teams with ease.
Sand Veil Garchomp: Could potentially skirt past potential counters since you had a 20% chance to fail most of the time. It was also very bulky for a sweeper and had numerous switch-ins. Immune to Thunder Wave.
Excadrill: Pretty much caused Hyper Offensive teams to fold by itself. It was practically impossible to revenge kill, was decently bulky with numerous resistances, immune to Thunder Wave and Toxic.
Swept most of the metagame with one set.
Thundurus-I: Practically impossible to wall, while having Prankster Thunder Wave to potentially fuck up your counters.
Deoxys-S: Sets up hazards / screens so ridiculously easily that there was pretty much no real feasible way of stopping it. It was also able to run an offensive threat that revenge killed half the metagame and swept if need be as well.
Genesect: Rock Polish Genesect was very difficult to revenge kill (in this, I mean WAY harder than Tornadus-T) while having excellent type coverage to kill pretty much anything that it needed to. When it wasn't doing that, it was probably the most versatile revenge killer to have ever existed.
So what can Tornadus-T do in comparison to these heavy weights? Oh, and just a pre-emptive counter to "U-turn to counter" arguments: Just because Tornadus-T can U-turn to a counter (or Dugtrio) does not make it broken. Think about it. When you say "U-turn to a counter", your are automatically involving another Pokemon. You cannot logically prove that Tornadus-T is broken when you add another Pokemon into the mix.
By the way:
Let's wrap it up by judging it against standard smogon banning criteria:
1) Predictability: Scout, Scarf and Standard Rain Abuser. You won't be fretting at how to counter him. 2/10 on danger scale.
2) Counters: It's counters and measure of counter acting include strong priorities, scarfers and special walls, which aren't many to begin with and you might end up tossing something before you can wear it down, especially with SR. No usual OMG THIS THING IS IMPOSSSIBLE LET'S PROMOTE THE NICHE SON OF A NICHE OF A PU POKEMONG TO KILL IT! 6/10 on danger scale.
3) Overcentralizing: Offensively nobody contests this thing is a beast, and rain isn't exactly lacking in partners or quick fixes to his mentioned problems, it is obvious that Rain is the dominant weather with it being the super star and the core of most offensive rain teams. 8/10 on danger scale, and only because you still need the support to push the dominoes.
When have we EVER used these criteria as the "standard banning criteria"? We don't have definitive banning axioms any more. What we used to have, were the three characterisitics (Offensive, Defensive and Support).