Had a server in that DC for a few years until recently (no knock on Hetzner they where excellent, just didn't need it any more).

Robot is a brutally functional tool but it does function (well) and had zero issues.

Regarding Robot, I think that it's completely fine for what it is. I almost never interact with it, and instead just configure my server as I see fit over ssh. Hetzner's value proposition is extremely cheap no frills servers -- you're paying for the server, not the management interface. If you want management interfaces that do a lot of useful work, use a cloud.