Hart was pleased with the way England had begun Euro 2012 and paid tribute to Nasri for his goal.
"Samir's a clever player, we dropped off a little bit. It was a good goal and we have to concentrate on the good performance," Hart said.
"You can question the team all you want, but you'll always get belief, pride and quality.
"People forget that we're England and we're a good side. In that first 25 minutes they weren't ready for us."