Wrath of Khan is the best thing Trek ever did and Trek has ruined itself repeatedly trying to capture that lightning in a bottle again, rather than, for example, doing something totally different like Best of Both Worlds or the Dominion War. Nemesis failed for so many reasons, the main one being it wanted to be Wrath of Khan (and no one who watched Trek all those years could claim Picard's clone or Data's prototype were a Nemesis to either of them.) The STORY of this latest film did not have to be Wrath of Khan. Why not show this new crew exploring the universe, build up some charisma between them based on their new adventures and what new and interesting thing they found out there rather than rehashing an old storyline? With CGI they could put anything they want on film, and yet there hasn't been a Star Trek movie really addressing the theme of exploration and the continuation of the human adventure since, well since Final Frontier to be fair, but I think really since The Motion Picture.
Everything is a big shoot 'em up trying to be Wrath of Khan, which itself spent much more time dealing with themes of lost youth, friendship, and obsession than it did action. Except for the Reliant's initial attack on the Enterprise and the cat and mouse in the nebula, very little of that movie is an action piece, yet the movie flies by, is filled with tension throughout, and though it is a point frequently made, Khan and Kirk are never in the same place the entire movie! All of their drama is on the viewscreen or over the communicators. You didn't need a fist fight through San Francisco. Action is fine, but nowadays it is a cover for a lack of story and there being no "there there".
And I hate the way Spock is used. Everyone says, "Spock is so logical and unemotional" except now every person who writes for Spock thinks that there should be a moment where Spock loses it and emotes all over the place in everything Spock is in. In episode after episode of the original series, Spock might have some un-Vulcan sarcasm played for humor in his comments, but he was his cool, logical self. There are examples of Spock emoting, usually when some alien force affects him in some way. But what makes the moment in Amok Time so special when he sees Kirk is alive is it was RARE. Then you have the journey as an older man in the films when he embraces his human side and realizes logic is the beginning of wisdom. It is a beautiful journey for a tortured soul, but even when we see Spock in Next Generation he doesn't weep over Sarek's death or anything. But now every movie these hack writers have Spock sing a song, try to strangle Kirk with his bare hands, or in a moment of total fan wank yell "Khan!"
And why exactly would that time travel cause yet a third look for the Klingons so they now look like Nikto?