Star Trek Into Darkness
isn't very good, but Generations
is the worst Trek film.
Personally, I'd want the prime timeline back. I don't think us being in an alternative version of 1960s Trek is a particularly fresh, interesting place for the franchise to be. 2 films are never going to replace the insane amount of proper Star Trek though, so it isn't a huge issue. If NuTrek was set in the true timeline, it wouldn't remove most of the problems. I'd take a science-fiction orientated tale in the Abramsverse over a popcorn flick set in the main universe.