I totally agree with the above poster. I can crush anyone in my guild on non-hardmode content but when you do non-hardmode content in a hard-mode farming guild, you really don't care about these fights. As a member of a hard-mode guild (currently 11th in the us 28th in the world) you really only try to maximize dps on hardmodes. To be honest i think the true test of dps is going to be 0 keeper yogg saron as far as a benchmark of DPS goes. XT is a joke as far as dps goes, why would you want to rate people on a fight where you can chain heart phases? (my guild can) that means guilds with better dps can have a heart up 100% of the time, minus the few seconds your making up the extra 1% you left on the heart before killing it. Also the XT fight has alot of RNG components (grav/light bomb and popping defensive cooldowns for tantrum) and DPS really doesnt have to be balls to the wall, let me reiterate THIS FIGHT IS A JOKE. Again like i said Yogg = max dps or you lose, therefore everyone in the raid is pushing it to the limit and it would be a more accurate measure of DPS, in my opinion.
If anyone is interested, my characters name is spacejam now (formerly hïmself) and heres a link to my guild WWS so you can see how a dk measures up ON hard mode content, which inevitably is all that matters. The other dk in my guild is frost to, so that might help you decide on which spec you like better for what fight.
WWS---->
Wow Web Stats
Also for people who have questions, im going to try to check my messages more often.