Wow so this is where all the action is.
Allow me to enter my 2-cents. I actually like avpr, even though that's not saying much as I do have to put it at the end of the entire alien-predator-avp franchise movie list. I felt it was an honest attempt at making an entertaining movie while taking rather hefty risks. Of course many mistakes were made but none of it was done on purpose or maligned the rest of the series.
First off, they screwed the pooch on the lighting. What ever it was, it doomed this film. The next thing, people were clamoring for a hard R movie; not the PG-13 get as many butts in the seats AVP. So the bros upped the graphic violence and gore. They crossed the pregnant women in peril line and once again doomed the film. That type of violence was simply not palatable to the average movie goer and was on top of axing a kid on screen. Personally this is a movie about horrible things and it did bother me a little bit but for most people it was way too much and they should have known better. The third problem, the gestation of the alien was way too fast and that is entirely the fault of a poor script.
The skinning thing, it flat out doesn't matter. This a predator after all, maybe he killed, skinned and hanged the corpse as a warning to stay the f**k away from the area. Of course no one understood how to read the warning.
The dialog, again, so what. It's a hick town, "dale you too stupid to talk" and "the government doesn't lie to people" is exactly what I'd expect the people there to talk like. The sewer, ambush, hospital (until the helipad) and final solution was done well. The cgi blood splatter was absolutely atrocious and alone doomed the film as well. They could have did without the teen angst as well and no one cared about the people in the film either. Once again that is due to a poor script.
So yea it is a bad movie but it is not absolute shit.
