Devonix
Come on Wolverine isn't that overpowered.
4laugh
(Hello, guys - I'm new.)
I don't know loads about comics - mostly what I've absorbed from my Marvel-loving wife and big titles over the last five years or so. So maybe I can offer a different perspective on Wolverine vs Superman.
As a kid, I assumed I wouldn't like Wolverine. This was because he seemed grumpy and ubiquitous. I'm not fond of the old Fox cartoon, and that did Wolverine no favours - he's totally unreasonable almost all the time in the episodes I've seen.
It was the films and X-Men: Evolution that changed my mind. Hugh Jackman plays a very likable Wolverine, and Evolution tells some great stories about him. I think he works well as part of a team - probably why he's on so many. You can tell some interesting stories with him thanks to his long life, and he can also happily fade into the background for other characters to step forward. He's strong without dominating.
Superman's a very different character. He works very very well as a protagonist, which I suspect is why he's got so many film and TV adapatations to his name.
That said, it took a long time for me to find a Superman adaptation I liked. I found the 70s film tedious. I thought the most interesting thing in the new film was James Marsden's character. I never caught the Bruce Timm series (wonder if it was shown in the UK?).
A few years ago, I caught a few episodes of Smallville on repeat - I think that's the show I wanted. An ongoing series with plenty of proper drama, as well as lots of silly villains and action adventure fun. It felt like Superman at his most Spider-Man.
I've started rambling, so to sum up:
Wolverine is probably as popular as he is because so many X-Men spin-offs and adaptations have used him well.
Superman has probably gained his share of detractors because of lack of exposure for certain audiences, who therefore assume nothing interesting can be done with someone with what my housemate calls "blanket super-powers".