Storm is a main character in the X-Men but shes not vieeed with much significance outside of that. If you think shes got as much relevance as Harley Quinn you are seriously deluding yourself.
It hasnt flopped though, the films have mostly been financial hits and Wonder Woman has been a smash.
Storm has more pop cultural relevance than Harley Quinn.
She is literally the biggest female superhero icon to an entire RACE of people. I can't believe people are this clueless or uniformed.
Go out and start talking to black people and African-Americans and find out how big a deal Storm actually is.