Exactly what I did. No big name school. With an undergraduate Accounting Degree, the MBA helped me better understand how to manage people and helped me in my critical thinking to make business decisions. Some may say it wasn't worth it, but to me it was worth it both in time and money.
Your sentiments are what we heard from our son. He said it gave him much greater understanding and a broader knowledge base (because they make you “think” outside the box and take classes in disciplines that aren’t your strong suit or related to your major.) Plus it encouraged a lot of networking, and that usually pays off in the end.