Despite JJ Abrams saying he didn't feel that beholden to the Star Trek canon, he didn't go far enough in bringing new elements. So much time was spent on the "origin," there was little left for plot or character relationships. What there was -- i.e., why Nero was in such a bad mood -- didn't engage.
Star Trek has been successful on the big screen in tighter, character-driven conflicts. Take Wrath of Khan. Almost no time wasted on Khan's background saga. Instead we moved quickly into the plot with real consequences for the principal characters.
Other than an introduction to the youthful cast, I didn't feel this accomplished much. Perhaps it wins by setting up the next in the series, but I don't think Star Trek will wear well.
Robert Downey Jr. is the standout here. As the somewhat reformed, always unpredictable skirt-chasing mechanic millionaire, he brings a spark to a Marvel character that hasn't been seen in Toby Maguire's dead-eyed depiction of Spiderman or in Ang Lee's lackluster "Hulk". Gwyneth Paltrow also stands out. While her Pepper Potts is a highly paid indentured servant to Tony Stark's man child, Gwyneth quickly establishes the high ground over Tony's would-be harem. Jeff Bridges amazingly is unrecognizable as the anti-Lebowski. The other winner is the suit itself. No inanimate piece of metal, the Iron Man armor is alive as a computer-controlled sports-car decked out human missile. And that's the real punchline in the movie. While the action scenes may not set the world on fire, it's really hard not to walk out of the cineplex without thinking "Gee ... I'd really like one of those!"