SO TERRIBLE. (Spoilers)
I'm watching it again here and I just can't understand how this script got greenlit. The rest of this rant is basically nothing but spoilers btw.
Portable transporters that work across multiple galaxies? Communicators that work instantly between galaxies?!? WHY EVEN BOTHER WITH STARSHIPS?
Magic blood of immortality?! Can Kirk even die now? Kirk's basically a full time werewolf now.
How is someone from 300 years ago supposed to wake up and immediately start designing and building next level weaponry and vehicles???? If we woke up a genius from 300 years ago, they'd design us a really neat cannon, not a satellite based death beam or something actually advanced. Kahn didn't even need a minute to catch up, he was instantly up on 300 years of advanced technology. Actually, why would the military of Kahn's time even want soldiers that smart? If they could be engineered for strength and reflexes, they could also be made relatively stupid and subservient, which is what their masters would want. It doesn't take a tactical genius to know that even if you COULD make a soldier like Kahn, you definitely SHOULD NOT.
Why the hell would Spock yell? About anything, ever? He sure as hell isn't going to belt out a 'KAAAAAHHHNNN!!!'
There's so much more, I just don't understand how this script was given the OK. The effects and production values in general are all top notch, but the story is absolute rubbish. Terrible, the worst, -1 of 10. Two teenagers and bong could definitely crank out a better script than this.
The acting is generally well enough but Cumberbatch was just awful. As others have noted and apparently the director originally wanted, Del Toro is who should have played Kahn.