That is just a general overview, however, i have to agree.Hey guys, I'm currently making an effort to improve my presence on Smogon.
My opinion is that Tornadus-Therian should stay right where it is, in A+ Rank. It's one of the metagame's premier pivots, and it has a diverse offensive and a usable utility movepool. It can run a somewhat defensively-oriented set, or an all-out attacker set, and more, and the brilliant combination of it's movepool, typing, ability and statistics make it a great check for many dangerous threats in OU, like Keldeo, Serperior, Scizor-Mega, Gengar, and Latios.
However, it's Flying Typing is kinda bad defensively which unfortunately gets it many strong hits on it, while it does allow it to check many threats.
It's Special Attack could stand to be better, so in many scenarios it finds itself needing to use a LO to deal considerable damage. Almost all of its sets do not address it's relatively low defense, so many physical attackers will not have a hard time OHKOing and 2HKOing it. It has a fantastic ability, Regenerator, that unfortunately is moderately hindered by it's weakness to Stealth Rock. Many of it's moves are subject to missing at the worst possible times, also.
I can't really see it ascending to S Rank, but I also cannot see it dropping either, at least not now. I think that A+ is the perfect rank for it in my opinion.
Torn-T has a nice position right now, since all the stuff it checks is quite common, Serp has risen, Loom has risen, all this is enjoyed by Big Burd, not to mention it already blanket checks relevant A+ stuff like Keldeo, Mega Zam or even Manaphy who is S rank, but, it is reliant on the AV to actually check those, and Torn is piss-weak without a LO, and too frail without AV.
Is kinda similar to Raikou in the fact it just blanket checks a lot of relevant threats.
Overall I think is one of the weakest A+ mons, but it is able to hold its place because of the utility it provides and the relevant stuff it checks.
Keep Burd in A+.