For the sake of saving a little time, I'll copy/paste my reasoning from my application to vote. As the following will make clear, I voted Latias OU, with some trepidation about the fate of a metagame with Latias in it.
My criteria for voting any Suspect Uber is to evaluate how well it functions in three aspects, as delineated in our new official definition of "Uber", found in the "Portrait of an Uber" thread in Policy Review. I understand the Offensive Characteristic to mean that a Pokemon is Uber is it can sweep with relative ease without much (2 or more turns of) setup. I understand "relative ease" to mean "without a significant likelihood of being stopped by reasonable means". For example, Lucario does not meet this characteristic despite being able to sweep with only one turn of setup, because there are several Pokemon that outspeed and OHKO Lucario that cannot be OHKOed with Extremespeed, such as Salamence, Gyarados, and Zapdos. All of these are good Pokemon in their own right, they are not gimmicks. By this definition, I believe that Latias fails to meet the Offensive Characteristic; with one turn of setup (presumably Calm Mind) Latias will still fail to KO several common OU threats which can OHKO her, namely Tyranitar, Scizor, and Metagross, and risks being revenge killed by Mamoswine or Weavile as well. I understand the defensive characteristic to mean that a Pokemon is Uber if it is far too difficult to kill by reasonable means; many teams will be hard pressed to kill this Pokemon even if the player makes significant sacrifices to do so. Cresselia fails to meet this characteristic, for example, because although it is almost impossible to OHKO, it has no reliable recovery and is weak to Pursuit; it can be killed very easily and without much effort by common Pokemon such as Tyranitar, Scizor and Heracross. By this definition, Latias fails to meet the Defensive Characteristic, as even the bulkiest Latias sets would still not be able to survive high-powered supereffective attacks such as a CB Scizor U-Turn or a CB Tyranitar Crunch. I understand the Support Characteristic to mean a Pokemon that can support other Pokemon so well that they can sweep easily (or by extension stall easily) through the opponent's team. Gliscor is not Uber, for example, because all it is very hard to kill and stop from Baton Passing +2 Atk and +2 Spe, it can be killed with Water attacks or repeated Ice attacks, Taunted by a faster Pokemon, or (p)hazed if it lacks Taunt. Latias has two notable uses as a supporting Pokemon: her knowledge of Wish, and her ability to set up dual screens. While she would be the fastest user of dual screens in OU, she frequently dies before both are set up, and it is worth mentioning that while she benefits most from Reflect (which protects her against Tyranitar/Scizor/Metagross), most Baton Passers benefit most from Light Screen (such as Gliscor and Scizor). As a result, while this is the characteristic that I am the least certain of, I believe that Latias fails to meet the Support Characteristic. This is the reasoning behind my voting for Suspect, as you might imagine, I intend to vote Latias as OU. I am concerned for the health of the metagame should Latias become OU (four OU dragons is too many for a healthy metagame, IMO, as TAY and ToF demonstrated), yet given the characteristics of an Uber, I cannot help but conclude that Latias is OU material. If a metagame with Latias in it is overcentralized around Dragons and Steels, it is as much the fault of Salamence and Kingdra as it is of Latias (which are both clearly OU as well).