How do I positively discuss a disasterous job experience?

Apologies in advance for the length--I’m dealing with an extremely frustrating situation, and I’d like to get some opinions on how to proceed.

I completed my MBA in 2011 from a mid-tier, but large private school (3.5 GPA, Student Organization President, won (and created) multiple case competitions). I had 10 years of engineering/operations experience in energy/industrial roles, and wanted to obtain an analytical role that utilized my background (corp development, project finance etc.). I live in the Northeast, and my preference was to stay here, knowing full well that it isn’t the hotbed of activity for those roles. Recruiting was horrible, and I was lucky to eventually secure a related position in Corp. Development. Unfortunately, the company was struggling and going through a reorganization, which meant that my job wasn’t safe.

About a year after starting, a connection I had met through a conference and kept in touch with offered me a position with his firm (he’s a partner). The role was project finance advisory—I’d develop financial forecasts and transaction structures for energy sites. The deal was that I’d take a step down and start as a staff accountant, and in six months, I’d hire my own group and build the practice. That’s where it went all wrong. The firm requires a CPA in order to advance past staff level (I was told when I was recruited that the CPA was only needed above manager level). I do not have, nor would I ever care to get the license. The scope of the job also changed. Rather than utilizing my background and experience, I’m doing tax and audit type things that back offices of other companies outsource to accounting firms. There are no bonuses for non CPAs (also not what was told to me), and I’m not eligible to contribute to a 401k for a year. My salary is lower than the job I had pre-MBA, no chance of a promotion or raise, the people are among the dullest I’ve ever met, and the frustration and anger are negatively affecting my health and marriage. Needless to say, I’m searching high and low for an exit. If I didn’t have a kid on the way, I’d quit today and mow lawns. Seriously.

What I’d like to hear about is how to address this in future interviews. I don’t necessarily think they lied to me, my experience here has shown that there is no organization, and nobody really knows what’s going on outside of their cube. I won’t badmouth the company in an interview under any circumstance; I usually say something like “the position turned out to be a bad fit”, or “the scope of the role was not what I had anticipated”, but I can only assume that in either case, I look bad, or I come across as an unpredictable job hopper (I’ve been here for nine months). Prior to grad school I had a great and stable history, and I need to highlight that.

To preemptively answer some questions: I’ve talked to people in companies related to my pre-MBA position—I’m “overqualified”, and it’s unlikely that I can go back. The first company after grad school did indeed eliminate a bunch of positions, including mine, so that’s out. I thought I did research the new company in advance of joining, but you can’t do much when you’re given incorrect information by the person you know best there. The progression past staff accountant wasn’t in writing, I took his word for it (that’s on me, I understand). Finally, I’ve given up trying to stay in this region of the country—I’m willing to go anywhere.

TL:DR I was given materially incorrect information in joining a new role and company. How do I explain the short duration of my time, and how do I not sound bitter and/or negative when asked why I’m leaving in upcoming interviews? And how bad will I look to future companies?