Anand's wins in round 3, 5 and 6 , without suffering any loss confirmed he is soon to be the uncontested classical world chess champion (succeeding Kasparov and Kramnik). So far his performance in the match is close to perfect play.
It is remarkable to observe how he managed to win twice with the Black pieces, (games 3 and 5), with the same variation where he left his king in the center and attacked along the g-column and the a8-h1 diagonal. Kramnik's idea in playing the variation was probably to survive the middle-game and "win the endgame" with his a- and b- pawns. But he probably underestimated the initiative Black enjoys in this variation. 10 d5 instead of 10 e5 was worth a look.
Game 6 was a different story: 9 h3 and 10 g4 was an aggressive play by Anand, which was further neutralized by Kramnik who managed to swap the queens. However, 19 ..c5?! was a premature and eager sacrifice in my opinion, 19..Rfe8 was called for. Black never got enough play for the pawn in that game. It was too early to counter-attack with Black.