Roddick haters unite in this thread. Zzz, I hate how much hate Roddick gets. Pretty unfair. Just because HE wasn't exactly the next Sampras, doesn't mean he is a total failure, yet no one is ragging on other true one-slam wonders like they do with Roddick.
Isner is far better. Isner has 3 big weapons. Serve, forehand and net play. Roddick has only a serve and yet it is inferior to Isner's. Roddick's groundstrokes and volleys suck. Roddick is a class B retriever. Isner plays offense and is capable of taking a match out of Nadal's, Djokovic's or Federer's hands. Roddick can NEVER claim to control a match against any of these 3 players.
Sure, maybe not now consistently, but he used to pound that ball to oblivion 2001-2004, and there have been several matches since then when he has shown us his best like IW/Miami 2010, Dubai 2008, Cincinnati 2006, among others.