I really don't agree with Roddick on hawkeye. If anything it adds to the entertainment value of the match. When a call is challenged and the match is tight, it definitely creates tension as everyone is awaiting the video replay to see if it's good or not.
I can somewhat understand what Andy means, McEnroe going nuts in his prime provided some entertaining moments, and he still does that on the senior tour to entertain the crowds, but let's not forget that the senior tour is +/- a glorified exhibition circuit. In today's easily offended world, if Federer/Nadal were to act the same way on the ATP, most people would feel personally offended. Let's face it, how many of you are disgusted by the commentaries/attitude of Fognini, Gulbis or even Roddick in his last year? There's a reason why everything is PR filtered today. Fact of the matter is, you can't commit a "faux pas" when your building a brand like Federer/Nadal, because if people are against you, no one will endorse you.
As much as people say Federer is robotic and calm, I tend to disagree. You can sense how he's boiling up inside when things aren't going his way. The disgusted look at the umpire/lines people, the SHUT UP to the crowd, his disapproval of HawkEye (Wimby 07), etc...Over the years, he's provided many entertaining moments just with his on-court attitude lol.