If mongodb is in fact a poor choice for their problem set and they made it anyway, you're better off not being there. If it WAS the pragmatic or correct choice

If mongodb is in fact a poor choice for their problem set and they made it anyway, you're better off not being there. If it WAS the pragmatic or correct choice, then I'd say spend a few days or nights getting up to speed with mongo. Learning to use it is not that hard, it's keeping things working smoothly/tuning when you have a huge cluster and many consumers of it that's hard.