I haven't seen ANYONE use this (other than myself and one other person who I clearly don't remember), but Kyurem is currently an underrated threat in the UU metagame that not many teams are prepared for. Yes, it's weak to a shitton of things like stealth roaches and it needs some support, but on a pressure stalling set, once it sets up a subsitute, there's only a few things that can effectively prevent it from further PP stalling/launching moves from its base 130 attacks.
To further elaborate, Kyurem's base HP allows it to make 101 HP subsitutes with just 52 HP evs, which allows for some extra EV investment elsewhere, particularly in speed in order to outspeed a few extra pokemon it would not be able to without the investment. Kyurem's bulk is not something to underestimate, either-- for example, a Timid 252spA Raikou's shadow ball or a 0/4 spA Slowbro's Psyshock does not even guarantee the 25% damage needed to break the sub. Momentum moves, such as U-turn and Volt Switch also don't break Kyurem's subsitutes. If that wasn't enough, Kyurem even gets Roost, which will further annoy the opponent or perhaps cause him/her to click that forfeit button if he/she cannot do anything about those annoying subsitutes. Momentum moves, such as U-turn and Volt Switch also won't break Kyurem's subsitutes,
The only pokemon I've seen that were able to successfully check/counter a subbed Kyurem is (AV) Metagross, Chansey, Florges, and mega Gardevoir, as far as my knowledge goes. (I know I could be unaware of at least several other checks/counters like mega Heracross and Cinccino, but I just don't see those enough yet and I'm not going to search and list every single pokemon that are capable of doing so.) AV Metagross only takes about 40-45% damage from Earth Power and can smash it back with its steel moves, although switching into Earth Power is a waste of Metagross's valuable HP, while mega Gardevoir can just simply shit on Kyurem with its pixilated Hyper Voice and shrug off any of its moves. Chansey will not die to Kyurem's attacks, although if it stays in and tries to seismic toss away the subsitutes, it's definitely not going to get the job done due to the PP stalling. Don't even bother taunting Kyurem though; chances are, its ice beam/earth power/dragon pulse/whatever attack move is going to end up dealing a solid chunk of damage
I hope this actually convinces someone that (sub) Kyurem isn't just some useless pokemon that's sitting BELOW the Limbo-C category because almost no one even bothered to touch it in OU. As long as you don't switch it into Rocks a headbreaking amount of times or make some extremely dumbass choices with it, I don't see why Kyurem is simply something to leave out of the equation.