I thought the lighting was the worst I've seen in a Trek movie. Picard, Riker and Data looked really old. Stewart looks younger in more recent films.
I thought they could have gotten rid of the dune buggy scenes. What was that all about anyway?
I didn't believe for one second that Shinzon was Picard's clone just as I never believed Sybok was Spock's brother. nuKirks portayal of PrimeKirk is more believable.
Shinzon just needed to be a lot less creepy. Just a little bit like Picard in anyway.
That all being said its not all bad. The space battle was OK. Data was heroic. Stewart gave a fine thoughful performance as usual. The wedding was good. The Romulans supporting Picard was great.
The mechanism for wiping out the Romulan senate was cool.