Many of the arguments as to why Deoxys-S is uber are, to me, utterly ridiculous.
"It's really fast, therefore it is unfair." "Deoxys-S gets used, therefore it is unfair." "The metagame has changed since the introduction of Deoxys-S, therefore it is unfair." What the hell kind of reasoning is that? Deoxys-S has the audacity to be GOOD at something, so it needs to be relegated to ubers? If this had been something arbitrary like Salamence and Lucario that had been initially banned and later introduced into the metagame, do you really think there would have been no impact? Clearly, the metagame would change significantly by introducing any one of those into a meta that didn't have it. But, so far as I know, there is no serious movement to ban either of them. Why should Deoxys be treated differently?
Being the best at a particular role is apparently NOT grounds for banning, else Blissey among others would require immediate banning from OU. "Invalidating Choice Scarf" (as though Choice Scarf's only use was to make sure that nothing in existence outspeeds you...) is not enough, since there is no reason why Choice Scarf needs to be a good item, and frankly, I have always questioned whether it really warrants the hype. Being versatile is clearly also insufficient to warrant banning. Otherwise Tyranitar, Salamence, Lucario, Dragonite, Garchomp, Gengar, Azelf and others should be banned too, which few to no people advocate.
People seem to have some kind of preposterous expectation that every Deoxys-S should be fully counterable with a single Pokemon, and furthermore, that it must be one of the particular six Pokemon they already have. Very few OU monsters indeed can be covered 100% by a single Pokemon, so I see no precedent for this expectation. If you have only one Garchomp counter, for example, you are almost certainly vulnerable to being screwed by one of Yache Berry, Substitute, Scarf, Band or ChainChomp. Garchomp is arguably not even the most extreme example here, so if you think he belongs in ubers, consider Salamence or Lucario instead and the argument works the same way.
The argument that "I can't play the same team as I had before Deoxys-S came in without possibly losing if all my guys are at low health and the opponent has Deoxys" (approximately) is situational to the point where it's hardly worth addressing. If you build a team with a big hole in it AND allow the opponent to maneuver the game to the point where he can exploit that hole, and he does... is that because the threat is broken, or does it indicate that you just screwed up? In this day and age, you simply cannot counter everything 100%. Deal with it.
I do find the vocal protests about Deoxys's supposed "elimination" of offensive teams hypocritical, as those voices tend not to whine about how Blissey kills off all-special teams or how wallbreakers can destroy all-stall teams. I think most people do tend to find offense-oriented play more enjoyable, myself included, but that is not justification to make bad policy decisions to promote it. If fun were a legitimate point (which it is not, since it is entirely subjective), Garchomp would've been shown the door about a year ago, and Blissey would have been forced to exit stage right more than half a decade ago and never allowed to return. Being able to play any set of 6 that you bloody well feel like is not an objective we have here, because it is unattainable.
With all that said, I think Deoxys-S should continue to be monitored, but I don't feel it's inherently more dangerous than any of the top OUs. It's fast, but the sweeping should get snapped in half by any respectable STAB move, and is ruined by anything carrying T-Wave that lives a hit. The defensive one can hardly be considered broken if Starmie and Cresselia (and hell, even things like Dusknoir and Spiritomb- at least they have useful resistances) are not. However, if it really does turn out that it forces everyone to run multiple counters for Deoxys-S, or counters that are vastly inappropriate for the team, or counters that are total garbage for any purpose other than stopping Deoxys (although this latter is a weaker one, since Magnezone is effectively garbage for almost anything other than killing Skarmory but Skarm seems to be considered "fair"), then by all means, it should be re-evaluated and likely banned. Unless one of those occurs, or we finally come to a consensus on what the definition is for "uber" or "overcentralizing", I see no reason to prohibit its use.
Despite the twelve-foot-long post, however, I do not at present feel comfortable actually casting a vote, as I still feel like an intruder here. If anyone actually bothers to read my post and finds it persuasive enough to influence their vote, fine, I'm hardly the only person to have put forth any of these arguments. But I don't want to actually jump in with a vote since I don't feel like D/P is "my" game to mess with. I offer my perspective only because so many of the arguments against Deoxys are just so unpersuasive and/or unreasonable that they irritate me.