So the five archetypes are needed for the "ritual", the jock, whore, scholar, fool, and the virgin. But actually most of them weren't really like that, and thus were manipulated into being so. For example Chris Hemsworth's character was actually a pretty smart guy who started acting jockish, and the same for his girlfriend who wasn't normally that slutty.
My criticism would be that aside from about a 30 seconds scene at the start we don't really see any of them NOT in those roles anyway. The first time we see the Whore she's already gone blonde, the Jock is already throwing a football around in his first scene... so I just thought that aspect could have worked better.
Also I wonder what other peoples theories were as the movie was winding down to the end. I thought at the end when the Virgin turned on the Fool (I just want to call him Topher Brink), but then got attacked by the werewolf, I was thinking Toper was gonna let her die, something like "that was a pretty foolish thing to do... and by the way, I've never had sex either."
Just thought that would have been a fun twist role reversal. Then the world could have been saved
Loved the part near the end too with the office guys celebrating, that one random guy trying to ask a hot girl out and totally failing was so random and brilliant.