It also depends on what you realistically can get out of an MBA... some don't get that much out of it, while I believe I got tons out of mine (former R&D Engineer, went to top-10, or top-15 depending which publication you're reading)
Could you give examples of the kinds of things you've learned? Maybe top-3 or top-5. For instance, the first time I wrote a business plan in school, it was an eye opener.
Note: I took a bunch of business courses but do not have an MBA.
