First of all , I always knew that the spirit of the series was Stiles so now that he is not in the movie the absence is heavy , also I liked the whole Alison thing but the Derek thing was unnecessary to the point that I didn't even feel bad , I was like... Oh...ok and the way it happened was almost an insult to the character he made through much harder stuff and it could happen differently and with different outcome , the jobs and character development from the series to the movie was nice BUT the whole movie was just processing the changes and the man in black not an actual plot , I expected more.