No. I can separate things from the source material and try to enjoy them on their own terms. I enjoyed the 93 Super Mario Bros. Movie, and that was very far removed from the game. It wasn't a great movie, but it was fun because of it's absurdity.I feel you're still watching it through the lens of someone who'd watch a cartoon series like ATLA. There were a bunch of adults (roughly boomer age) who enjoyed the movie and were interested in the cliffhanger and stuff.
The Last Airbender movie had a ton of problems with it, even without comparing it to the show. Again, pacing and acting were huge flaws of the film. Those aren't issues because of it's a poor adaptation, those are issues because of poor film making in general. Heck, Dragonball Evolution is rated higher than this film, and that was even more far removed from the source materiel.
I've also heard people who never saw the show say they didn't like the movie. They hated the movie more though once they saw the show.