I watched this just after watching the original Trekkies, and to be fair, if I hadn't just seen the other movie I might not be as critical as this one, but it is very weak in comparison.
Trekkies 2 feels like it was made out of left over material from the first movie. Not literally, since they did go out and film new stuff, but thematically, since they covered the topic quite thoroughly in the first movie and simply had little left to work with. The movie feels less focused and more random than the original; a bunch of disparate elements poorly tied together by an international theme. It also has rather cheesy narrative dialog introducing each section that sounds like the sort of artificial patter you get when people introduce an award at the Emmys.
It does have some interesting things in it, and if you haven't seen the first one you might think this was decent, but for fans of the original movie the most interesting part of this one will probably be the end in which Trekkies discuss their reaction to the original movie.