I didn´t feel any tension at all (maybe you should watch the film without knowledge of the book). All I remember is some honkeys getting fried by rays and at the end some crakah pulls up a AT-4 and blasts back at the alien walkers.
Seriously I was bored after five minutes and me and my buddy sat and talked shit instead for two hours. The effects and alien walkers were well done.
Thought it started out really good. I was like "Man, this movie looks like it's gonna rock" and then well....it just stalled. Kind of the like the aliens. HAHA I slay myself.