MC being stupid and spoiled is fine, those are just character flaws to overcome; challenges. But she's also got a sense of entitlement as a spoiled brat, and while this isn't a deal breaker, that the author doesn't seem to want to give her any character development on that front to keep this sort of general story-tone means that this story will stay this way. That will become increasingly irritating as she grows in power and influence, but remains an asshole in these respects.