Star Trek is an insanely fast and fun re-imagining of the Star Trek franchise, and it generally works. Those who pine for a deep, thought-provoking film in the vein of The Wrath of Khan or First Contact may be disappointed, as this film makes momentum its primary concern. If the Star Trek: The Motion Picture was focused on slow plot development with minimal action, then Star Trek is its polar opposite. While there is plenty of character definition and development, this film does it in a very quickly-cut style, giving us hundreds of great character "snippets" rather than a few dozen longer sequences. Sadly, the film is perhaps too focused on the momentum, often interweaving too many subplots into the narrative in order to keep the pace going strong. It's a trade-off, and while I'm not sure it was for the best, it certainly keeps the film interesting, which is, at the very least, fun.
"Fun" may be the key word in this new film, which seemingly ditches the science fiction "thinker" feel of the old Star Trek for a much more exciting narrative. Humor similar to that seen in Star Trek IV abounds in this film, which may annoy some and thrill others.
One significant point must be addressed: whereas Nimoy's Spock was nearly oblivious to Uhura's advances in the Original Series, in this film they actually become romantically involved.
Every time I hear myself or anyone else bring up that plot point, I have to stop and take a moment to gather my scrambled thoughts up off the ground. While the film certainly explains why Spock and Uhura's coupling should occur, it is still very off-putting. However, the humorously shocked reactions of the other characters to this relationship both acknowledge and alleviate viewers' concerns.
Another seeming plot hole is the fact that Kirk and most of the main characters are mere cadets, yet are instantly promoted to being the senior staff of the flagship of the Federation by the end of the film. From what I've heard, there was a bit of dialogue that was cut from the film which explained that, due to the time-altering events of the film's prologue, the timeline is attempting to "mend itself" by pushing the same people into their same roles, despite the altered state of the universe. That would have gone a long way to explain things, and I'm not exactly pleased that that incredibly important line was cut.
There are several events in this film that are so mind-shatteringly epic that they forever alter the Star Trek universe. This new series of films is not the same Trek we've known for 40 years; this is something entirely different. Some may not initially welcome the change; it took me about twelve hours to accept it. Now that I've had a good morning's sleep, I've realized that I love this new movie. It's character-based, fast, and fun.