The defending European Cup champions routed the team from Belarus 5-0 on Wednesday night in a one-sided clash from Group H.
"We played against the best team in the world," Goncharenko told UEFA.com.
"We were a bit bound by fear, made stupid mistakes, but it was a great experience. We saw how to play football at first hand, how to work the ball, how to tackle opponents and so on.
"I can't blame my team, despite the ugly result. Our opponents' name weighed heavily on the players, who failed to show their full potential."
Lionel Messi was the star of the show once again as he moved into joint-second place on Barcelona's all-time goalscoring list with his brace in the 5-0 mauling in Minsk.
Goncharenko conceded his team were simply not used to playing against opponents of the same quality as the Argentinean maestro.
"If we had a handful of matches like this during the season, it would have been much easier for us. As for Barcelona, they showed extreme pace and we just couldn't cope with it," Goncharenko said.
This was the second 5-0 win in a row for Pep Guardiola's side following their weekend success over Atletico Madrid.