Okay, you people are really exaggerating how bad this thing is. I don't think it'll be top tier OU by any means, but Hoopa honestly doesn't look nearly as bad as several users have made it out to be. Base 150 SpA is incredible, and STAB Shadow Ball is one of the easiest moves to spam in the metagame. Base 70 Spe isn't fast, but it is by no means terrible. It's more than enough to outspeed a slew of slower Pokemon, and once it's in on something it can outspeed, base 150 SpA with a boosting item and one of the most spammable STABs in the game is downright scary. It also outspeeds pretty much every common unboosted Pokemon in the metagame with a Choice Scarf with the exception of Mega Manectric/Alakazam, so it has a bit of potential there.
On the defensive side of things, it's still not as bad as people are making it out to be. Yeah, it's 4x weak to Dark and Ghost. It's not the end of the world, especially when those are the only weaknesses it has. Being weak to Pursuit and Sucker Punch sucks, but Gengar's not exactly taking them very easily and he turned out alright. Meanwhile, a Fighting immunity is pretty nice, and its Normal immunity and Poison/Psychic resistances can come in handy from time to time. 80/60/130 defenses are also pretty good. Hoopa's physical bulk may not be much, but its special bulk is really good. It's on Latias's level, to be exact. To demonstrate how bulky it is, a completely uninvested Hoopa can take a Specs Draco Meteor from Latios from full health 100% of the time. As long as you avoid random Shadow Balls and Dark Pulses, Hoopa is capable of taking a pretty wide range of special attacks.
Let's also not forget that we don't have the whole story yet as far as movepool goes. For all we know, it could have a fantastic offensive movepool that'll make up for its disappointing speed. It may look weak to Tyranitar and Bisharp now, but give it Focus Blast and Will-O-Wisp on a Substitute set and suddenly neither of those two want to switch into it. There's still a lot of possibilities, so it's honestly too early to be bashing it.