What the best players in the game do is not reflective of the rest 99.999.. %. If they wouldn't had soloed e.g. TOD on an FvS they would had done exactly the same thing on another class. People see these guys, see what they use, and then make the incorrect assumption that the class they've chosen is OP.
Nota bene: I'm not saying some classes are edit: not more versatile and more powerful than others. But that certain players that do amazing feats does not reflect on the class they are using, but instead on their skill and dedication. Lance Armstrong would beat me on a kids' tricycle, Senna in a soapbox car. It's never the tools that makes the craftsman (even though it helps the egos of us mere mortals to blame those...).