It was still weird for a player of federer's calibre to be so unsure in the big moments - he remarked he didnt know whether to go aggressive of passive...He needs to be match tough - to gain back the shot selection he is known for. He was hitting the ball well as you say, but he was definitely more aggressive than usual on the big pts - maybe no confidence in his consistency?
his forehand at times was really crazy against marcos but he couldnt quite get a hold of his serve which ultimately cost him in the end.
Good analysis. On all three of his match points, he played a mixture of aggressive and passive tennis. On his third match point, he started the point off in typical Federer-when-haivng-match-point-on-return fashion: i.e. two BH slices. Then he got a really good BH to hit down the line and he was an inch away from hitting a pure winner, but it's rare to see him go for such a shot. He began the point willing to be patient and then unleashed an uncharacteristic shot.
As you say though, he hit some really, really good FH's which is a good sign because his FH in other losses lately hasn't been anything special at all i.e. his loss to Davy in Doha, losses in last year's TMC/WTF, loss to Djoko, loss to Benny, etc.