The hope is that tony doesn't go so far off the deep end this time. I can see him supporting stuff like Registration and The Raft. But the moment he hires villains to capture heroes, creates a cloned Asgardian abomination, etc. is where he loses me.
I think the Russos get that and they want even the most diehard Cap or Iron Man fans to feel conflicted about the perspectives and arguments from each side.
That's what the real potential of Civil War was, that it wasn't just a good versus evil fight and that both sides could be validated and the solution was somewhere in the middle. Unfortunately Millar seems incapable of righting characters with shades of morality, so he had to turn Tony Stark into Victor von Doom or someone similarly callous and coldhearted.