The horrible jumps in logic seen in AVP are slightly worse than the teen drama. Emphasis on "slightly."
Umm, I would say the teen drama was really awful, but its a monster movie, in this case the human drama more importantly didn't interfere with the monster plot of bog the film down.
I would say treat it like a old school monster movie mash up (ie some of the Godzilla films, Frankenstein Meets Wolf Man or more accurate Frankenstein meets the Space Monster
). Maybe my preference to the Predator films (hell I love Predator 2) as opposed to the Alien films (there ok, I just like the Predator as a character more, though the Aliens are still good villains), can explain the analogy.
Go in with that thought and you'll be just fine (my friend hated it, but admitted besides the PredAlien biology, the monster scenes were all fine). Its just a side effect of the CW producing most teen actors these days lol. On its own though its is funny bad (the non-teen stuff is fine and adequate though).