Two classes that were good: Accounting, and Business Evaluation, both taught by Harvard professors, which made it very interesting. The rest were kinda flufy.
If you are an entrepenour at heart, and already have business skills, and MBA wont be that much useful. It is a two years commitment, plus costs a lot.
I'd suggest anybody just study accounting, business evaluation, and the ocasional entrepernurial class, and that will be more than enough.
It seems that MBA will be more valuable for people that like to look good in a suit, and want to join big corps, and where your 'title' matters.
Sadly, these sorts of attitudes are prevalent in many large IT shops. Personally, I run away from anyone who views any meaningful role (coder, CFO, COO, admin ass't) as just requiring a random body.