As it stands on its own, it's just not that good. As a reimaging of Khan, it's a hell of a lot worse. It's a movie that never needed to be made.
I like the concept of the Kelvin Universe movies. There are moments that really capture the Kirk, Spock, McCoy chemistry. I would actually love to see them return as prime characters because the characters are well-acted. Sans the lens flare and rehashed stories, of course. But "Into Darkness" just wasn't that good.
As a blockbuster cinema experience it was excellent. But once you watch it at home an digest it more you realise the plot is as convoluted as nemesis, and it repeats the space jump from the 2009 movie which is lazy AF. And that's before the spock scream and various other gaffes.
I still enjoy it for what it is though. It's turn your brain off entertainment and is still somehow one of my favourite trek films.