It looks like this whole Marvel Heroes thing is actually happening, huh? Back in May developer Gazillion Entertainment popped up to say 'Hey!' and drop a trailer and, surprisingly, it looks like it's got a lot of potential. That said, everything looks good in trailers, that's kind of the point. The only way to really tell is to get your hands on it and Marvel has announced that fans will get that opportunity next week at San Diego Comic-Con.
In the mean time, Gazillion has released a developer diary wherein David Brevik (of Diablo fame) touches on why he's excited about the project and what makes it different from the prior attempts at a superhero MMO. I enjoyed DC Universe Online a good deal, but it didn't have the longevity I was expecting. Here's hoping Marvel nail it with their attempt at the genre.