This is a website for a startup accelerator, not a pure tech site. Almost everyone here, including myself, has plenty of contact with MBAs. You might consider that when reading all the negative feedback you've received.
> the language of finance, macro/micro economics, marketing
This is like saying people get computer science degrees to learn about programming. Is it important for the job? Yes. Will you learn it in the program? Yes. Is it why people pursue the degree? Absolutely not. An MBA is an expensive, time-consuming certification. Nobody gets a graduate degree in business administration because they enjoy the classes. People pursue them because they provide opportunities for career advancement at the higher levels.
> Some of them are good, some are not.
This is the core of the problem. For a company, it doesn't matter whether the MBAs are good, because they're almost definitionally climbers and as climbers their incentives are fundamentally misaligned with long term success.
I'll use Boeing as an example again, because it's such a textbook case. Management (composed primarily of MBAs) discovered senior engineers were expensive and laid them all off. Twenty years later, their planes crash, their capsules leak, and their rockets don't work well enough to launch at all. Did they make the wrong decision? Well it looked very good on a lot of quarterly revenue reports, EBITDA was up, and the CEO responsible for most of those layoffs (James McNerney, MBA) retired well before the disasters to accolades, trusteeships, and not tens but hundreds of millions of dollars. From his perspective, he achieved the goal behind getting an MBA in the first place.
There's nothing wrong with ambition, but being wary of people with too much of it has been a tenet of humanity since before the refinement of bronze.