Alien - nice but was a bit slow to start
Aliens - my fav, watching a bunch of american marines getting hammered
Alien 3 - Not bad, just kinda biege on this one
Alien resurrection - exceptionally bad, the new director went too far by putting the human face on the alien.
AVP - Awesome film, great ending as well!

Speaking of films about monsters etc. What does everyone think of doom the movie?

Personally i loved it, especially the first person shooter bit.