Well, here is my question to you. Does Sleeping Beauty warrant a live action movie?
If no, well then it's a non-starter and that's fine.
If yes, I would argue that this is essentially just a Sleeping Beauty movie, however they decided it will do better to tell the story from Maleficent's PoV. She is very popular and the movie having a darker tone will help it hit the early 20s to mid 30s demographic, as opposed to a fantasy story about how lovely Sleeping Beauty is which narrows it down to primarily teenage girls.
Is the character all that complex? No. But you can always explore more, and when you have the "ppl think she is cool" thing going for it, you are already a little ahead of the game.
I think she is great bc of her design, her powers and that fact that she turns into a dang dragon. Lots of nerds like myself are basically IN as soon as a dragon is on the table. Sleeping Beauty was always one of the darker Disney films, and Maleficent one of the scariest and most evil of the Disney villains. Being the driving force behind Sleeping Beauty, it makes sense to go this direction with a live action adaptation.
I like what they insinuate in the trailer too, that there is something... Almost childish about Maleficent, and a little scared herself. Scared to reveal herself. Showing her jealousy in a new way will hopefully be refreshing. Instead of a character like the Queen in snow White, who is just vain and loud and masks her insecurities with more vulgar displays, I love that Maleficent seems more shy and in that way, also more dangerous, insipid and unpredictable and not wholly transparent.
I dunno, I'm insanely excited for this movie. It also helps that my fiancé went as Maleficent for Halloween the last two years and I found it highly enticing