I decided to try out the closed beta for the new Marvel MMO. It's not too shabby. It's free to play, so the price is right. You can pay money to unlock characters and costumes and stuff. If I read correctly, you could theoretically unlock everything for free. I imagine it requires a lot of grinding or some sort to get to that level.
It has a Diablo-like gameplay. You face hordes of minions. Sometimes a boss character shows up (Venom terrorizing the docks, for example), where you have to team up with other heroes.
The downside is that you can't make your own character. You have to play a Marvel character, so you see a buttload of Iron Man clones running around. For the beta, I quickly "bought" the Rocky Raccoon character because you don't see many of those.
When it comes out, I may play it. It didn't thrill me at first, but I was gradually warming up to it. Closed beta ends later today, so I'm done with it for now. It's supposed to release next month.