What are the main attributes you consider or considered when deciding where to go for part-time MBA?

That's a very general question. I guess people will say that you should consider the sort of attributes that the rankings measure, then whether an MBA is right for you, whether it's the right time, which schools will fit your goals and whether you have the support you need.

Many of those points are discussed at http://www.find-mba.com/article/526/traditional-mba-or-executive-mba-program and http://www.find-mba.com/article/506/how-to-pick-a-business-school-narrowing-it-down and http://www.find-mba.com/article/439/finding-the-time-part-time-mba-programs

Do you have a more specific question?