Marinette's singing was good but it wasn't her voice. It's very distracting and immediately pulls you out of the immersion when you hear some other girl with a much deeper singing voice over a high-pitched character.
Adrien kinda looks like a baby
Too much fart jokes the entire time we see Adrien interact with Plagg, when he's actually supposed to be more of his friend and try to help him.
There was wayyy too much Marinette denying that she's not Ladybug and refusing to try it until Tiki literally forces her to become Ladybug. It's repetitive and there's way too much conflict over this one issue when there is many more in the movie to solve. For instance they should have focused more on Hawk Moth and the developing relationship between Chat Noir and Ladybug. I was disappointed at how little moments there was between them so that they could fall in love. The ending felt unearned.
Ive read so much fanfiction far better than this movie. The ending with Adrien and his dad was maybe the only part that made me feel any sort of relief but even then it felt like nothing got solved because of the scene with Natalie and his dad saying "You're the only one I can trust" or something to her. So is he still evil??
Makes no sense.