It's true that some players perform very well on ToS. But when you take a closer look, those are the players who are pretty much the top of the pvp foodchain - we know what Ensifer does on barb, and for what I've heard he also was pretty much the best HoX on the EU servers. We also know what Lurvi does on BS. Then there's a handful of other ToSes who do well, but almost all of them are very good players on other toons as well.
By contrast, you see players from top guilds, who are experienced in PvP and have all the gear and AA, underperform significantly on ToS.
One further point: Due to the kind of damage ToS does (sustained AoE with very slow to build burst, unless you go for boring LS spec), the class is very gear-dependent to get kills, because of the way kills are calculated in this game. And sadly, kills are the only stat that is registered at the end of a game.