I too am disappointed by the nerf of the raids. I've read that Blizz justifies this by saying that they wanted folks to be able to finish stuff off before WLK. From my perspective, this reasoning kind of misses the point. For me raiding is 'the challenge'. Now there is no challenge. My guild was making good progress through ZA; we were just mastering the Hexlord fight. Then the patch. Next trip; all three chests done on timed run, all bosses one shotted. No deaths. Knowing that WLK was around the corner, I was really looking forward to putting the pedal to the metal and getting Zul'jin before the release, at his 'normal' difficulty. I was caught unaware by the pre-expansions nerf....
With all the new tanking abilities, I would much rather have tried these against the proper, difficult, old raid challenges to see how they fare. Wouldn't that have been a much more meaningful test of tanking 3.0?