OK, first off, th acting was weak and mediocre. It jumps around erratically let's just say. There are plot elements that definitely could be much better.
I did enjoy the majority of the movie, however. The alien was shown in small increments and was also plainly CGI'd and animatronic. The way the alien "saw" was a cheesy green color with watery edges. I did not like what the alien looked like in bodily shape. (Don't get me wrong, it looked bad-@$$.) My problem is with the alien's shape being extremely humanoid. It had a head, eyes, tall, and had a mouth. It's really a bit disappointing when all the creators think up is a human-like creature.
There was a creepy atmosphere that played itself very well, I might add. The bloody effects did suit well to entertain. If you're just wanting to watch a cheesy flick with decent FX, a decent alien, mild storyline and beautiful women who are not afraid to show off their bodies, this is a good movie to watch.