Spring [1] and I went to see Star Trek X: Nemesis [2] and as an even movie [3], it stands a very good chance of being half way decent.
It does have an interesting premis—after all, the Romulan system is a double planet consisting of Romulus and Remus and all we've seen so far are the Romulans (who branched off from the Vulcans long ago) and never any Remians ... until now. But we only get glimpses into the political situation between the two systems, which is a shame. I will say, though, that the space battle is one of the better ones I've seen (almost as well done as Star Trek II: The Wrath of Khan [4]) and I just couldn't believe the amount of damage done to NCC-1701-E (“There goes Picard's premiums,” I said to Spring).
Is it worth seeing in the theater? Perhaps if you like eyecandy space battles (my only complaint—the design of the Enterprise-E—there were parts when I could tell it was computer generated and what's with the Aztec design? The peak in design was still Star Treks I [5] & II [6]) it's worth seeing on the big screen, otherwise, it's a rental.
[2] http://us.imdb.com/Title?0253754
[3] http://movies.hsx.com/news/punt/
[4] http://us.imdb.com/Title?0084726
[5] http://us.imdb.com/Title?0079945