Agree with most except I am not sure about Lob..don't notice enough use or the 2nd serve I don't think Roddick has that good a second serve I would choose Fed over him there, and I am not so sure if Karlovic's serve is better than Fed's either. Power wise Rod and Karlovic are better but if it was about placement and diversity Fed definitely wins. I would rather have Federer's arsenal of serves than the sheer power of Roddick and Karlovic, I mean they have good placement but their serves are not to diverse. Federer can switch up between kick serves and flat serves and some slice serves. He definitely in my opinion has the best serve in the game.
Backhand I agree with Nalby but if I want to go one hand I want Gasquet.
Add mental i throw down Nadal.
Oh and passing I want Murray, I like his a bit more than Nadal.
I actually think Federer's serve is the most underrated weapon in the game. However, look at what Karlovic has. His BH is worse than Lopez, and his forhand, while now good enough to rally for a few strokes, cant win him points.
Just looking at the one stroke, Karlovic definitely gets it. He has power + height + placement.
BH i put Nalbandian becuase Gasquet's BH can be attacked. I remember watching him vs Verdasco at IW, and Hot sause was demolishing the BH, thats where he was attacking Gasquet.
For passing i put Nadal becuase of Nadal's awareness. We saw this in his final two matches at the AO. All he needs to do is to touch the ball, even if there is no backswing, and he can place it perfectly.
I respect your opinion, but i am just backing up mine