I agree with a lot of that. I actually really enjoyed the film from start to end, but the constant retreading of old ground is incredibly distracting.
I thought before I even went in, that if the 2nd ST reboot movie was a Khan movie that would be a pretty lame idea, but then to introduce Carol Marcus as well, and lift whole scenes from TWOK and indeed the most iconic line in all of Trek and just swap the characters about was really unnecessary.
As it turned out, it was a good Khan movie IMO, very exciting and Cumberbatch was exceptional in the part. I would have preferred a completely new story, but failing that they should have just left the other references to old trek to the inclusion of the Khan character.