I don't have experience with DigitalOcean support but there tutorial/help pages are indeed very useful, I have used them a lot.

Its an issue for DigitalOcean that if someones trying to install MongoDB on Ubuntu they can still use any VPS provider they want. The instructions that DO provides are not platform specific to them.

I still do want DigitalOcean to succeed though, I think there great and still love there product. I think building an S3 competitor(Not expandable volume storage) would make them more competitive. Its still going to be really tough though, right now any side project is going to be default on LightSail.