I suppose he was as good as he needed to be.
That's what Connors figured on the BBC as well (that's one reason for me to look forward to Wimbledon each year: to be able to listen to the commentary of John McEnroe and Jimmy Connors.)
I was only able to watch the end of the second set and the third set which wasn't exciting to be honest. Eschauer made a lot of mistakes. The commentator figured that it has to do with trying too hard: he knew that his shots had to be very good against Nadal so he often overhit his shots. The weather can't have made the match more enjoyable for the players but at least, it didn't rain.
Jimmy said that one the one hand, Rafa will be happy to have won it in straight sets but at the same time, he was hardly challenged so it's probably hard for Nadal himself to judge what level he's playing at. Sometimes, it's good to have a tough match in the early rounds just to test out your level.
By the way, I read that Eschauer was playing on old grass court shoes he borrowed from Florian Mayer. He doesn't have a clothing sponsor so he has to buy his own gear and he couldn't find grass shoes so Mayer lend him tennis shoes he used before.