Are you in Ensidia? Or one of those other top 5 guilds in the world? Ok if you are that amazing why are you in Naxx this week? Show something to validate any claims you have made. My guild is top 10 on my server, we aren't world class but we only raid 3 times a week, cause we have lives outside of WoW. I like spending time with my family, friends, and girlfriend. None of us play videogames for a living. We killed Razorscale first night but with the bugged trash and Ignis fisting people in the pot with 1 shots we called it. The next dey we went back and after a few attempts we got De constructor, certainly not a one shot, we did however get Heroic Nerf Engineering and Nerf Gravity Bombs our first kill. If you are in one of the few guilds that killed Yogg Saron already grats you are better than the rest of us, and you have no life outside of WoW, when you see finally see your first boob after you get the money together to buy a hooker make sure it is actually a girl.
I have seen 12.5k dps on Thaddius by one of the fail Fury warriors in my guild as you call him, prepatch. He also averaged 5500-6500 on almost every other fight in Naxx prepatch as fury he does about 5k now as arms, and is in top 5, but as fury he fell to about 4300.
Also blood DK dps on a short fight better be high, you have a ghoul / army of the dead / rune weapon and heroism. If a blood DK cannot do 7500-8500 in a 2 minute stretch with full raid buffs then they suck.
I did Naxx 25 in a pug this week. Secondly I have of the Nightfall, but no I don't have immortal we lost in on KT 2 weeks in a row due to a DC and an add tank being tombed, and once cause our ret pally killed himself on Raz by tab targeting with martyr before it was a big known issue. Guess you have me on the immortal thing I mean your guild is obviously above connection problems, bad luck, or bugs.