I'd go to a .Net MVC group and tell them how great it all sounds and that your considering using it in your enterprise. Then tell them what you really want to know is what they >don't< like about it. That may give you some insight into what your coworkers don't like about it but aren't willing to admit out of fear it might hurt their argument.
Then if rails happens to not have those same issues you've got something to work with.
I took a quick look for a group myself and they seem pretty thin though... hmmm
Maybe that's a drawback in itself?
good luck!