The Italian thought the Turks would have made life more difficult for Los Blancos, particularly after the first-half dismissal of Sergio Ramos for a professional foul
Sergio Ramos was sent off early in the game but goals from Gareth Bale, Alvaro Arbeloa, Angel Di Maria and Isco ensured that Umut Bulut's equaliser just before half-time was insignificant.
Ancelotti was sightly shocked at how the Blancos swept aside Roberto Mancini's men and argued that Juventus, who defeat Copenhagen 3-1 to move second, two points ahead of Galatasaray, now have the edge in the battle to follow Madrid through to the last 16.
"After being left 10 players on the pitch I didn't expect a game of that easiness," the Italian told Spor Smart.
"We made some changes in our system. My team reacted well in the second half and that's how we won it.
"Juve are one step ahead of Galatasaray, because a draw will be enough for them. But Galatasaray have very passionate supporters. They can win this game. It will be a perfect match."
Cristiano Ronaldo missed the game at the Santiago Bernabeu through injury but Ancelotti still took time out to back the Portugal international's bid for this year's Ballon d'Or.
"Yes, Ronaldo the best player in the world," the former AC Milan boss stated. "Statistics show that he is the best in the world by far.
"His team-mates continue to help him and he's doing his best [to recover]."
Meanwhile, Isco, who has featured intermittently under Ancelotti since arriving from Malaga in the summer, admitted it has not been enjoyable being relegated to the bench but says he is working hard to make it into the starting line-up on a regular basis.
"It's not nice to not play, but it's the coach who does the line-ups," he told reporters after netting a fine goal against Gala. "I always worked to give 100 per cent on the field.
"I feel better close to the area, but the coach can put me where he wants. I am still working with as much hope as ever."