While it was weak against Nalbandian, his loopy FH and overall weak serve pace wise hurt him even more I think. Nalbandian's BH is a like a left-handed FH that can create angles like no other BH so it will always trouble the Fed BH and has other than on a few occasions. The reason that Fed started dominating Nalbandian was because of the aggressive early FH and good serving alongside a steady BH.
What happened to the Roger that used to play aggressive first strike tennis? Initially the defensive mindset was limited to clay, but if he doesn't learn his lesson soon, he's going to face more tough losses in later rounds at important tournaments by players that take the initiative away from him and have the confidence to win against him.
Easiest possible group
Hardest possible group
Looks like one of (Djokovic, Nadal, Federer) is going to have to face the other two back to back in the semis/finals. From that perspective I'm not sure if having Djokovic in your group is a blessing or a curse. It'll be interesting to see how that plays out.