The cool thing is that Tyranitar risks getting 2HKOed by V-create, so unless you sac a Pokemon so you can bring TTar in (which means Victini can still do ~50% to your Tyranitar on its second V-create before dying), Tyranitar will LOSE to Victini (unless you're running a fast TTar, which I have hardly seen). The typical bulky Tyranitars I've been seeing get outsped even after the -1 drop, lol. On the topic of Pursuit users, Tyranitar is virtually the only thing you have that can even dare to Pursuit Victini, since everything else dies horribly to V-create.
Actually, Jolly T-Tar is pretty awesome, but, yeah, I agree with you otherwise. Victini is awesome and if you can win the "weather war" it can completely decimate teams. Pursuit is becoming increasingly uncommon in this metagame, with the only users being Tyranitar and Scizor, who both tend to forgo it for stronger alternatives. Victini can almost OHKO Rotom-W with V-Create in the Sun, while only taking about 1/3 damage from Hydro Pump in return. That's pretty insane. I've been fucking around with Victini lately and I must say that it is fucking powerful, however I believe it is not broken for a couple of reasons.
1. Victini sits on the 100 base speed benchmark, which, although isn't slow, isn't really that fast. This wouldn't be a problem if it weren't for the fact that Victini NEEDS to be Adamant. Without an Adamant nature, Victini becomes much less threatening. If it didn't need to run Adamant and could run Jolly instead, Victini would find itself in a pretty cool place, being able to outspeed Sazandora, Haxorus, Darmanitan, Adamant Garchomp, Adamant Randorosu, etc. However, the most importantly, Jolly Excadrill. Unless it has a Choice Scarf (which would be very stupid if you ask me) Victini has trouble outspeeding many pokemon, (even though it can still outrun Rotom-W. To me, this isn't really much of a fault, as I believe Victini has enough bulk to mitigate its lack of speed, however I can see how this can be a problem for some people.
2. V-Create is absurdly powerful, however, its drawbacks are less-than-optimal. Having lowered Defense/Spdef/Speed may seem to be not as bad as lowered attacking stats, but actually, in this case, it is much worse. Having lowered speed turns many to-be 2HKOes on switch-ins into hit-and-runs due to Victini being in danger of being outsped and killed. Furthermore, Victini's Psychic typing leaves it dramatically vulnerable to pursuit after a single V-Create. Although I said this wasn't a problem due to it being uncommon, I do not base my arguments on the state of the metagame due to the fact that it constantly changes. Pursuit usage could skyrocket for all we know, and Victini could become a little more than useless a week from now. Shrang's scenario where he 2HKOes the Tyranitar switch-in is a tad too convenient as well, as it relies on the Tyranitar having a specific EV spread that could easily be altered to neuter Victini. Scizor is much less of a problem due to the fact that it (obviously) is OHKOed by V-Create and Victini resists Bullet Punch.
3. Sun is pretty fucking hard to keep up. With Ninetales being vulnerable to all of the weather starters, one would be hard-pressed to find a place to switch it in without some clever switching. This may not seem to be much of a problem, but in the case of most sun teams, it is due to most sun team staples being weak to Stealth Rock. This ensures that Victini can only see any real play when the opponent's weather starter has been sufficiently whittled down to the point where Victini can kill it. However, this is the point where Victini's coverage comes into play to redeem it. Victini boasts amazing type coverage in Electric/Fighting/Fire, nabbing SE coverage on Politoed and Tyranitar, while pummeling Hippowdon with a neutral V-Create. With sufficient prediction, Victini should be able to eliminate the Weather starters, however a smart player would have different checks to Victini so as not to risk losing their weather slave to it. This is where Victini's Stealth Rock weakness really hurts it. Victini can only switch in a limited amount of times, when it needs to be able to switch in nearly all the time in order to weaken it's counters with a boosted U-turn or any coverage move. This, coupled with Victini's limited (albeit useful) resistances, severely cuts its chances at switching in. Hence, the conclusion: Victini just can't be in play that often. However, Rapid Spin support becomes very effective on Sun teams and Pokemon like Donphan suddenly become effective, having its Water-weakness removed. This allows it to pack enough power to sufficiently threaten spinblockers like Jellicient, however, sometimes this just isn't enough.
Don't get me wrong - Victini is amazing and I love using it. My point is that I believe that Victini has enough faults that prevent it from overpowered, and therefore should not be nominated for Suspect Voting.