I do wonder these days if people just judge a film on how flashy the special effects are and not on the story being told. This film, i think, is a case in point. I have read elsewhere that the monsters look terrible, like an evil version of the Mystics in The Dark Crystal (which they do a bit) however there are plenty of other effects which are very real looking and are probably over looked because they blend in so well, which is the point. I particularly like the fighter aircraft.
The film itself has a good plot with a few surprise twists and turns and ends nicely set up for a follow up movie, However some of the "flash back" scene's aren't to well annouced and interrupt the flow of the narrative a bit.
Overall a decent movie, fairly well acted that entertained me for an evening, worth renting.