Semper's Stupendous to Infinity and Beyond Everything Marvel Movie/TV Thread
It's based on a bunch of stuff said by reporter Jeff Sneider who never actually said what the problems were and it was more him speculating that it may have problems connecting with audiences. And he pretty notoriously has a low opinion of superhero stuff anyway.
A few other leakers refuted what he was saying and said they'd heard good things. So, at least for now, I wouldn't put much stock in this report.