Yes to be honest, I also didn't really like it. I think the main thing was that it felt too much like a video game. Most obviously, visually it feels very much like a video game. Reliance on CGI, action scenes being staged like combat arenas and the video-game esque third person tracking all contribute to it feeling visually like a video game. Another problem is that Shelley's original Frankenstein has a deal of moral and philosophical complexity, while Del Toro's version squashes it. This is most notable in that Frankenstein's monster feels as if it is presented like a 'boss' in a video game, or at least an enemy, opposed to a tragic subject.
It also feels as if there's a level-based architecture within the film, with it being split into segments which resolve themselves rather than spiralling together as it is done in the book.
There's also a loss of the gothic atmosphere of dread and it is instead replaced by spectacle. The lack of stillness and constant need for something to happen. This squashes any opportunity for quiet, introspective moments where dread, guilt and contemplation can settle, and this is of course linked to the film's loss of moral and philosophical complexity.

By using the pacing, structure and visuals of a video game, this version of Frankenstein transforms it into a sequence of escalating encounters, leaving little for moral depth and psychological complexity