A mediocre story, but a must watch for long time fans
It's a must watch for long time fans of the show, it offers a good closure. However, if you're not a fan or if you haven't seen the show before, it's not recommended. David Henrie wasn't in the movie, so that was one of the major disappointments, however the story itself isn't that bad. The lesson that it teaches is surprising, as Alex was never the best Disney role-model, but she is the most relatable. It's a nice story of liking yourself for who you are, rather than who others want you to be.
The best part of the movie would have to be the action sequence, it's surprisingly very different than what we've got in the past. The spells resemble something from Harry Potter (admittedly on a much lower budget scale), the fighting actually involved hand-to-hand combat, and was actually very well choreographed.