I did read it, and I liked it. Turning Darkhawk into a major player was a surprise. They seem to be on a 90's throw away character kick right now, but what they're doing with these previously "who gives a shit" characters is pretty awesome. Looking forward to seeing what they can do with Sleepwalker.
I don't think that it was revealed how Wolverine gained the stone in any of the books I read. If it was, it must have been a brief explanation, bc I don't remember. There were several Wolverine minis going on lately, I didn't read any of them, but perhaps one of those explains it. I do know that he gave his stone to Black Widow, and she is the current owner.
Yes, the current Infinity Watch is a motley crew. It makes sense to have people from different backgrounds holding the stones, they won't be quick to trust each other, necessarily. Stilt Man is an obvious character who won't let anyone have his stone, who trusts no one else. That isn't to say that someone else can't overdose him, but in order to keep the stones separated they need to be held by those who don't trust each other. Black Widow is good bc the others know she can't be trusted. I like the dynamic.