Why are you bringing up Spidey, Wolverine, and FF? Of course they are there most popular. That still doesn't negate the fact that all those previously mentioned are icons in the marvel universe.
I'm bringing them up because no one on the avengers was/is on their level. They are the BM, SM and WW of Marvel. DC has more icons than the JL main 7, but no one is on their level. I'm saying that because with the Avengers for the average movie fan you had to(or they felt they had to) establish them, where as the JL are bigger than them. I'm saying Spiderman because everyone knows about him from his books and numerous cartoons, so you really don't need to start with the beginning. I had friends who didn't know who Thor was, or didn't have a problem with the Will Smith as Cap rumor. You can show your broads a pic of Superman, Batman or Wonder Woman and they'll most likely at least know who they are.
Anyone of you that weren't comics fans probably didn't know much if anything at all about any of the Avengers except for the Hulk. But I'm almost sure you knew about SM and BM.
Marvel did an excellent job boosting the characters, but I'm almost 100% sure if they would've had all the rights to their characters, Avengers would've been on the back burner.
Thats all I'm saying. BUT, like I said we won't care if the movie's dope.