One the one hand, it was rather refreshing to have a Romulan-themed story in quite a long time. The action sequences are super and the effects shots are great.
On the other hand, this latest (last?) Trek installment did leave this reviewer with several questions. Why did Wesley Crusher show up at First Officer William Riker and Counselor Diana Troi's pre-wedding banquet (see TheNextGeneration episode "Journey's End") ? What is Worf doing on board the Enterprise-E (see DeepSpaceNine series ender "What You Leave Behind II") ? And with Data ceasing to exist as a sentient being (he is said to have been killed off though he never in fact lived) and hence unable to assume the role of Second in Command, who then would assume Riker's role - Geordi, Worf, or someone else?
Part of the blame for this movie's dismal box office performance must rest with the studio, both for releasing it up against "Lord of the Rings: The Two Towers" and deleting at least 41 minutes of filmed material. Having said all this, the movie itself comes up somewhat short indeed. The main flaw seems to be that it never sufficiently delves into the cause(s) for Shinzon's anger and enmity towards Picard and the whole human race. After all, was it not the Romulans who treated him so shabbily all these years?
It is far from certain if a feature-length story featuring DSN characters will be made, either with a few crossover characters from TNG or none. However, given the unexpectedly weak showing at the box office for this film and the less-than spectacular track record of its preceding films (only one is said to have reached the US$100M threshold) it is highly unlikely that there will be any more Star Trek theatrical movies; The Wrath of Khan, a film from which this one is unjustly accused of ripping off, nearly became a non-theatrical movie.