I haven't finished reading it yet and will probably edit the comment after I have, but at this point, I want to say I really don't want Spider-Man and X-Men to be a part of the greater Marvel cinematic universe. For one thing, there are so many better fitting elements of the Marvel universe for them to play with that would have chance of getting in if they had to spend that time working Spider-Man and the X-Men into it.
For another, I don't think either of them would make sense in the context of the MCU. For example, Spider-Man and X-Men are both required to get hate from the general public (Spider-Man because Triple-J turns the city against him with news, the X-Men because of a bigotry metaphor), but in this universe, heroes are established and worshiped. Especially in the case of the X-Men, it makes no sense. I mean, you've got Hulk (A giant monster), Thor (a man with god-like powers) and Captain America (a drug-powered superman). All of these people have powers that are either natural, or in some way a part of who they are and they get to be heroes, but X-Men are hated because their powers are mutations. Honestly, is the average person going to be able to tell the difference between the Hulk's powers and a mutants powers enough to really get some bigotry going, especially when the X-Men are helping save the world alongside the heroes they already worship?
So, yeah, I would rather Spider-Man and X-Men remain in separate continuities to the Avengers.
However, I do wish they'd put somebody competent in charge of Spider-Man.
And now that I've read it all:
I totally agree about Black Cat. It would be nice to see her being made into a more interesting character than she usually is.
Don't know anything black Spider-Man, though, so I can't comment on him as a character. I'm down with the idea if it's executed in an interesting way. But that's why I don't want to see Sony take it on. They clearly have no idea how to make good movies and I don't want to put up with the internet exploding with racist trolls *and* seeing the idea being royally fucked up as well. That's more annoyance than I wish to bother with. On the other hand, I would be all for killing off the current Spider-Man, as he and his stupid Edward Cullen haircut irritates me.