***SLIGHT SPOILER WARNING***
The film, like many box-office releases of late, is heavy on CGI and special effects. Unlike some Michael Bay films though, the whole storyline and plot was not overwhelmed by the insane effects.
The film itself was rife with undertones, most noticeably its political and environmental ones. I love the idea of two differing people ultimately having the same end-goal, and finding that love is indeed color-blind. The rather anti-war and anti-violence themes in the film was barely concealed as well, with many of the human leaders reminding me of early Bush Administration tactics. As for the environmental undertones, it was a little exaggerated at some parts (think Pocahontas) but it was sensitively done in my opinion. I like the overall 'green' mentality of the aliens ("blue monkeys", in the words of the human military leader). It's a fresh perspective at a time when most films concentrate on the 'flash-bang-gore' experience for the viewers.
This has to be Sam Worthington's best film yet, much better than his performance in Terminator. A lot of the cast were unknown to me, but I think they did an awesome job, especially the one who played the alien princess.
All in all, great story, greater undertones, impressive performance, and very nice battle scenes. My only regret was that I did not go to the loo before watching it; it turned out to be over two and a half hours long. :P