Finally, a ranking I don't immediately want to dismiss

https://www.businessbecause.com/news/mba-rankings/6377/forbes-mba-ranking-european-business-schools-offer-best-return-on-investment

"The Forbes ranking is based solely on the median return on investment (ROI) achieved by graduates from the class of 2014. Schools are ranked based on their 'five-year MBA gain', or the net cumulative amount the typical alum would have earned after five years through an MBA, rather than staying in the workforce."