Visually, I really enjoyed the beginning. It was just cool to see Spock in that bronze suit and a helmet with green visor.
The twist they made having Spock as the one that screams "KHAN!" instead of Kirk worked very well for me. Since I was never a Star Trek geek I have no attachment to that moment from Star Trek II: Wrath of Khan. I thought that it was clever to revert the roles because it reflects Spock's character. A half human/ half vulcan character who in the beginning of the film states that he would rather be a Vulcan than goes through the terrible emotions humans go through.
When we go to the 3rd act I felt the rage of Spock, who now completely embraces his human side. I was rooting for Spock to kick the ass of Khan really bad.
And he did!!
It was entertainning to see Khan trying to smash Spock's cranium.
Spock pinching Khan - The highlight of the film.
It was great to see Spock's-10-times-human-strength in action. It's so fulfilling to realize how strong the guy is. A friend of mine told me Spock has green blood. What a badass guy.