*Spoilers*
As someone who absolutely loves the series, I was able to slightly enjoy some of the themes in the movie. But there are issues with pretty much everything. Put simply, the story line was lacking depth and harmony. By the time the movie was close to being finished I was like 'Oh is that it?' Teen Wolf as a show is very detailed, precise, meaning the audience gets to indulge in the thrill of the story being told to become invested. With the movie, none of that was created. In the show, it shows many scences of the "pack" solving mysteries, having discussions and talking. They were just running around in this movie. Sad really. I said I enjoyed some of the movie, I really only enjoyed watching the flash backs from the series haha, and I will say, Allison coming back and remembering who she was, wasn't so bad for me because she was one of my favourite characters.
Elli, Derek's son in my opinion was used to fill the void of Stiles. His wit, come backs was much like Stiles. Even though I didn't mind his character, they definitely needed him to make up for a missing character like Stiles.
The acting. Omg. Well, only a few were in character. And besides that it was super corny and fell short of the quality acting in the show. Scott, Sherif Stilinski, Melissa and Deaton were the only characters who weren't cheesy. I mean Allison was okay too, it was bizarre because she couldn't remember anything. So she didn't say much.
Fight scenes didn't have the same ferociousness as I did in the show. There wasn't much fighting at all really.
In the series there isn't any swearing. To me, it's a jump to all of a sudden have characters like to nogitsune and Argent dropping the F bomb. Weird.
The nogitsune wasn't the same as in the show. Didn't look the same or sound the same.
There isn't any character development for anyone new on the show. I don't mind for the main characters, because we know them. But for the others, it was like they got the part but didn't get any lines. Hahah strange. Liam didn't talk either. Honestly Liam is a great strong character. They did him dirty.
Finally, if your a die hard fan like me. Watch it. Was satisfying that Scott and Allison ended up together, they had the best chemistry on screen in the show.