I'd like to see something like that as well but not even on the mmorpg level rather any good multiplayer level. Just some free web games on it would be cool.
Defends on what you want. I personally thought Marvel Ultimate Alliance was great (got to have the Iron Man), and if you liked the X-Men Legends games, it's basically more of the same. Justice League Heroes is basically the same thing, but with the DC Universe instead (and it's lame...ok, so I prefer Marvel). I'd start there. FYI, avoid the Wii version of MUA, the control scheme is completely broken.
Another one that comes to mind is Freedom Force vs. the Third Reich, which is similar to some of the other games mentioned (basically an isometric action RPG) with more emphasis on character-building. This one has more of a silver age feel to it.
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory