to be fair it was kind of a fad. The superhero movies 10 years ago were terrible, and predictable, and contrived. Now when they make a superhero movie, it isn't just a good superhero movie, it's a good film. And when they aren't a good film, there is a massive back lash.
I'd disagree with that. I just watched "Amazing Spider-Man2", and while it was a little bit better story wise than ASM1, I was having a really hard time buying the Harry Osborn story, as Harry was suppose to be 20 in the film, but the actor playing him looked to be about 12, and between Peter and Harry I think the age difference is supose to be months, not 8 years. Plus I really did not give a care for the Gwen character. I realize that in the comics she is Peter's first girlfriend, but I found that there was no chemistry between the actors in the movie.
So to date, I would say the Spider-Man films from 10 years ago are holding up better than the newer films. Plus in ASM2 I was able to tell when an effect was a CGI effect a lot more easily than the CGI in the 10 year old films.
So I wouldn't mind seeing Sony relinquish their rights to Spider-Man. X-Men on the other hand, I saw it about a month ago and a Fox is doing a good job joining the two movie storylines into a cohesive story: sure there were some duds like XOW, but out of the 3 new super hero films I've seen (X-Men, ASM2, Man Of Steel), the X-Men movie was by far the best.