Mulan (2020) spoilers - I didn't watch this but watched multiple reviews online and Mulan is a Mary Sue from the start. She's just hiding her true power levels and can literally do whatever she wants. Whats the fun in that? Her character didn't grow at all in the movie. It's way different from the animated original where you see her journey to becoming a warrior. You rooted for her to succeed. But in the 2020 version, she's unstoppable right from the get go.
Star Wars Episodes 6-9 - Rey Palpatine! The sequel trilogy basically established that any random person can be one with the force and you don't even have to train at all to be the best. Rey was somehow skilled at repairing space crafts (Millennium Falcon), able to sword fight just fine, etc. I'll admit, before the trilogy was done, I used to defend Rey. I was like "just wait for the other movies to come out. I'm sure they'll explain how she got her skills. Maybe she got her mind wiped. Just wait, jeez!" But nope! From my understanding, the force needed to be balanced and Rey was the chosen one. How fucking lame!
These are only two recent examples.
But do people really like that shit?
I'm not very familiar with Superman and at first glance he definitely appears to be unstoppable and crap. Which is one of the reasons why I never liked Superman but I will admit I'm pretty ignorant about him. But speaking to friends that are familiar with DC and Superman, they tell me there are ways to beat him without having to rely on Kryptonite. So that does make things interesting.
And to not sound sexist, I'll talk about Neo. Yes, he's the one and is showing flying and surviving gun shots and stuff in the first movie. But it worked because in Matrix 1, we get to know Neo, his training, and all of that. He didn't have all his powers until the end of the movie. That's why it worked. He had flaws and appeared to be a regular guy.
So, I'm wondering if casuals like Mary Sue and male equivalent characters? I also have to mention that when I see characters that are so strong and have little to no flaws, I go against them and root for the bad guys. lol