it wasn't bad. The only mistake they made was not giving us time to get to now the characters, and actually like them, before they killed them off. Like the pregnant chick. That should have been waaay more devastating but instead I was just sort of like ehhh, sucks to be her. Also, I was hoping there would be a queen. Don't get me wrong, the Predalien was rad, but it's not an Alien movie without a queen, and I don't get what's so special about Predator DNA, that when mixed with Alien DNA, automatically gives a predalien the ability to reproduce...
The point that practically all Alien movies have missed since the second one is that the reason it was so cool is that it was just a war movie, not neccessarily Horror or Sci Fi, but then it just so happened to turn into this fucked up horror scif fi situation but it was still made like a classic war movie throughout.