One of the best hires I've ever made is a classic finance MBA -- top tier investment bank analyst program out of undergrad, HBS, private equity. The key was that:

1) He was referred to my startup by someone in our network, so he had at least a basic understanding of how our company worked.

2) He offered to come in as an intern just to get his foot in the door, and was extremely humble about his value to the company; basically recognized that he wouldn't that productive at first. (We brought him in as an analyst and he made because a lead PM in about 7 months).)

There is a lot to like about people with that background: extremely smart, hardworking, with hard analytical skills. If the two basic criteria from above are met (basic understanding of the business, strong desire to come in and learn), then I would strongly recommend snagging an MBA if you can.