I was wondering when the subject would come up, especially since it started to be a while since Mega Kangaskhan got shown the door, and here we are.
I think it's safe to say that Mega Lucario is going to get kicked out of OU without either of its feet touching the ground. Its stats would be perfectly okay to handle on their own, but then... well, let's just say whoever decided to give it Adaptability on top of that was smoking some heavy stuff. Sure, the less savvy people will just point out that it's very easy to revenge kill, but really, so is much of the stuff that's already in ubers. I'm not saying it's not a factor at all, I'm saying it shouldn't be THE factor. This thing murders stuff so hard it just shouldn't be allowed.
Genesect is a bit more complicated, and from what I've seen there doesn't appear to be a strong consensus one way or the other. Sure, it can't exploit rain to stay alive after a Fire attack anymore, but one thing to keep in mind is that the last time it was suspect tested, it didn't have Blaze Kick, it didn't have Extremespeed, and it didn't have Shift Gear. It didn't have any incentive to use its Steel moves either. Back then, the ol' scarfed U-Turn + tri-elemental set was bog standard prior to its ban, but now it's got such a huge case of four-moveslot syndrome that it can't handle all of its own awesomeness all at once. And that's a problem, because while Genesect has an answer for almost everything, it can't use all these answers at once. Naturally the best set remains the old standard, if only because it exploits Download better than any other, but... eh, this one'll be interesting to watch.
As for Deoxys-E, it happens to display impressive synergy with Mega Lucario, and as such it's normal that it's given a look at, but if there seems to be any consensus for this it's the "wait and see" approach. With Mega Lucario gone, will it still remain as dangerous? Of course it has a lot to offer, and will always be a powerful tool, but Mega Lucario's sheer destructive power and ability to put overwhelming pressure on everything is what makes Deoxys-E's (and, for that matter, Deoxys-LG's) hazards pay for themselves so well.
So, any thoughts on the matter?