Monster High: Welcome to Monster High online movie review - For a reboot, pretty good
One important thing to remember when going into this movie is that it is a reboot. All previous movies and webisodes are non-canon to this timeline.
As someone who has been a fan of the series since the beginning, I was skeptical about this reboot. But surprisingly, it is a good movie and a nice reboot to the series. While some fan-favorites are missing from the film (Ghoulia, Abbey and Spectra), they are not gone, according to the company. And save for Frankie and Lagoona, the voice cast is from the older movies and show.
The characters are given a lot more depth and the interactions between Draculaura and her father feel genuine. In the show, Frankie was just a klutzy character with no real link to her origins besides the stitches. In the reboot, she actually is into science and technology (a lot like Ghoulia was), better showcasing that she is the daughter of Frankenstein's Monster.
Overall, I think this is a fun and enjoyable movie and a good start to a new timeline.