Villa fan here.
The problem is he's nowhere near as good as Milner. I was gutted when Milner left, if Delph had left on a free without all loyalty bollocks, captain this etc, there would have been nowhere near the same issue.
I'm intrigued to see how delph will get on, it's not too long ago that he was though of as a headless chicken with a reckless tackle. Whilst I think he is more effective now, he doesn't score many, assist many or made villa tough to beat (might be easier at City). I have seen both Milner and Delph play for Villa, Milner was a far better CM than Delph, but couldn't get in at City in the middle (from what I saw of City) so I fear for Delph.
You're welcome here mate and free to express your opinion.