I think there's truth to this, but I don't think Trek is explicitly *not* about the manifestation of revenge. A lot of the best TOS episodes focused around base human emotions like that. I think, for example, Kirk's struggles with his anger at the Klingons, made more personal by the events of STIII, is part of what makes it such a fantastic film.
The real problem with the series' continued attempts to redux TWoK is that they always approached it very superficially. Nemesis, as the most extreme example, is almost a ridiculous parody of TWoK because it tries to follow it note for note but misses out on all the subtlety.
Right. There's nothing wrong with it being a subject for the films, after all the best movies, Wrath of Khan and The Undiscovered Country, develop it in a believable and interesting way. Even First Contact had an alright take on it. The problem is that revenge seems to be the only story they want to tell any more. Also, what Star Trek II, VI, and VIII all had in common was that there was a strong established backstory for the events of the film. Wrath of Khan was set up by Space Seed. The Undiscovered Country was set up by The Search for Spock and the history of war between the Klingons and the Federation. First Contact was set up by The Best of Both Worlds.
With the reboot, there's no longer any established history for the characters. So all these revenge plots can only be set up by five minutes of backstory exposition. The end result is stuff like Nero's trite and infantile revenge motivation.