The Champions League is a very special competition. Real Madrid had not been able to beat Atlético de Madrid this season until the European trophy was at stake. The Bernabéu fans know how important it is and the players fight after every ball the Atlético way, and that finally paid off when Chicharito clinched the spot in the Semifinals on the 88th minute.
Real Madrid controlled and dominated the whole game holding Atlético to just two shots on target that were not very dangerous. It's true that Simeone was happy with how the game was developing, because Atleti's gameplan was parking the bus. In fact, had not Oblak saved two very good chances for Cristiano and Chicharito, Los Rojiblancos would have been knocked out much earlier.
While they have every right to say that they were not beaten with 11 players on the pitch, Arda's red-card was a right call made by the referee and something Real Madrid made profit from.