Ok, so I finally got off my ass and watched this off the DVR. Part one was definitely ok. Part 2 just went off into loopy-loo land and destroyed the whole story for me.
Some of the effects were really lame, others weren't too bad. The acting was so-so from the entire cast. I really didn't believe in anyone except for the general, and the president was laughable.
The scientific techno-babble was really over done, and felt like the writers were throwing every technology they could think of on the wall and seeing what kind of mess it made.
All in all I'd have to chalk it up as a disappointment.