But surely there's someone out there who would want to make a good avengers game? Why the wait?
Creating a true triple A Avengers Title, is probably a huge undertaking. There are probably developers that want to make a game, but maybe they just didn't have the right vision.
A true triple A Avengers game should make you feel like you are the characters. Just like the Arkham games make you truly feel like you are Batman. But the Arkham games only have to focus on one character. With the Avengers, you have at the very least 6 different characters, should we only focus on the first Movie's line-up.
If I play as Hulk, I want to feel like the Hulk. If I play as Iron Man, I want to feel like Iron Man. If I play as Captain America, well, you get the picture. That means taking Hulk: Ultimate destruction, the inFamous games, the Arkham franchise, maybe a dash of Prototype, Crackdown, etc, and turning it into one, single game.
So you have all these characters, who are all very unique, and have to try to create a game that's balanced. And try to balance a game with character classes, that are entirely unbalanced to begin with. You have regular and enhanced humans with Cap, Black Widow and Hawkeye, and then you have the power houses Thor, Hulk and Iron Man, who all can decimate armies by themselves.