I'm no expert on German food, but I know what I like. This was good, and there was plenty of it.
I wasn't sure what to order, so I explained what I liked to the waitress (possibly the owner's wife?) who spoke very good English. She suggested a dish to try. I was not disappointed.
There were Thai dishes on the menu and a number of Thai groups there. So, I'm assuming the Thai food is good as well.
I'm going back to Roi-et next week to work for a few days, and I'll be sure and go back...at least once.
Give it a try if you are in town.