TsarMatt said:
The umpiring is very inconsistent, but that is pretty much applicable to any sport. Still, Federer is 100% correct, but sometimes the aura of the stadium and the status of a player can really impact the way an umpire, well, umpires.
In which case they shouldn't be umpires.
I'm a huge Rafa fan, as most of you know, but I, too, think he abuses the rules on a regular basis, and shouldn't get away with it, especially when others don't. If the umpires are afraid, for whatever reason, to enforce the rules, then get them out of there, and bring in people who aren't.