Do you know for a fact that it's bad? Have you seen it? Or are you just making an assumption because it has low box office figures which you are extrapolating as meaning it's a bad movie? It's rated above a 6 on IMDB and above 60% on Rotten Tomatoes, so it sounds like a lot of people enjoyed it.
Based on the non-response from the person above, I'm guessing they haven't seen it either. Most Marvel movies are mixed in terms of reception, and some men, whether they claim it has nothing to do with gender or not, will not go see a superhero movie where women are the heroes. They don't even hate the idea, they just don't see "woman movies." There are an unfortunately large number of men who feel that way.
But then, despite all of the people, all seemingly male, who told me that She-Hulk was terrible and it wasn't about gender, I thought it was terrific. So what do I know?
Hey you get my upvote. I had a blast with She-Hulk. A lot of Marvel is uneven but enjoyable. I like how, even after the show called out big CGI battles, Marvel still pumped out big CGI battles. Was wildly self-aware and yet..... here we are!