"Wouldn't be UU"
lol yeah just like Deo-D and Keldeo are UU by usage, as well as Terrakion, I believe?
Nah. Usage arguments are horse shit, no pun intended.
Anyway, it is actually getting an OU analysis. It's not done yet, but it could merit a look.
http://www.smogon.com/forums/threads/raikou.3499850/
I don't see how those things have anything to do with Raikou, it's been UU for a while and there's nothing to suggest it won't be UU again in XY. It had OU sets last gen, too, but that doesn't mean it's not generally outclassed and underpowered for OU (otherwise it would be BL).