Originally Posted by
gurkle
Apart from Marvel not having a Wonder Woman (DC doesn't have another Wonder Woman, either; she's unique and so is her creator), Marvel didn't do many solo pushes for any characters during its 1980s peak. They were heavily focused on team books. So they have a ton of Martian Manhunter type of characters, who are mostly only known as part of a team.
So Wolverine, the ultimate breakout character, did not receive his own solo ongoing comic until he'd been in X-Men for over a dozen years. None of the other X-Men, male or female, got their own comics. And it takes time to spin off a character and make them a solo star and give them their own supporting cast and mythology. Characters like Catwoman and Harley Quinn and Supergirl are famous, but they wouldn't be famous if they'd been given one miniseries or one ongoing and then went right back to being supporting characters forever. Trying to make the Marvel team-book heroines into stars now isn't impossible, but it's certainly much harder than it would have been if they'd started in the '80s.
As to why Marvel didn't work harder on this... I recall being told by someone who worked at Marvel that the feeling at the company in the '80s was that most solo books weren't good sales risks compared to teams. I don't know how reliable that is. But Marvel in the '70s through the '90s had very tight continuity, and that may have been a factor. DC's characters are mostly older and from a time when it didn't matter so much if Batman did one thing in his own comic and another thing in a team or team-up comic. But when Wolverine got his limited series in the '80s, he actually had to leave the X-Men for a while so he could go to Japan. Vision and Scarlet Witch got two limited series in the '80s and both times they left the Avengers so they would be exclusive to their own book. If you don't want a solo book to contradict the team book, then the only way to give (say) Storm her own comic would have been to take her out of X-Men for a while, thereby probably hurting the X-Men comic for the sake of a book that probably wouldn't sell.