Deathly Hallows Part 1 serves as a necessary separate movie to set the stage for the finale. It takes place outside of Hogwarts which is cool and interesting to see but I feel like it makes it lose some magic and connection to the others. There's also a lot that happens in terms of chasing down Voldemort's horcruxes but ultimately there's no "major" scenes. Again, more so serving the purpose to reveal history and context to prepare everyone for the last movie. It also had moments that were a little dragged out and boring at times. But nevertheless, it was needed to pave the way for the best and last movie of the HP series.