But it was an error-strewn Scottish display that left Robinson fuming, most notably when the home side scored just one penalty when Wales were down to 13 in the first half.
"We made too many errors, particularly in that first 20 minutes," said Robinson.
"If you make errors like that and give Wales the opportunities that we gave them... they grew in confidence, they grew in their physicality and ended up deserved winners.
"The guys are hurting pretty hard. Everybody's disappointed.
"That is unacceptable what happened.
"When they had 13 men we didn't take our chances. We had enough ball in the opposition 22 to get those chances.
"We knocked on a couple of balls and in the second half as well at 16-6.
"Wales had opportunities, probably not as many as us, but they took them.
"We've gone back a couple of steps today.
"It's difficult to quantify, a lot will depend on how we respond in two weeks' time against Ireland."