While I agree that some of the Achievements in Ulduar were pretty aweful (yes...yes I do remember Iron Dwarf ughh!!!), I think it got worse in ICC, for me, at least. And yes, the Sindy achievement made me want to quit raiding - you could not PAY me to go back and do that instance anymore. I raided it for almost a year, that's way too long. So many hard modes, so much aggravation and stress with incredibly -annoying- achievements, blech.

But at the same time, I don't know that I agree with you about the people who say BC raids were better being people who didn't raid in BC. I raided in BC. I did every bit of content from Kara to Hyjal/BT. The only thing I didn't see at level was Sunwell. And I still say those raids are better. BT is still probably my favorite instance in the entire game, if only for the thrill-inducing music and just BEING there. The fights were interesting, the trash was tough - but I do not remember the trash being as annoying when I was raiding back then. They haven't managed to make weapons or armor that looked as good since BC - with the possible exception of, you guessed it, Ulduar.

To me, I MUCH prefer for the achievement to be the heroic mode. It would make things so much less stressful when you're trying to get a stupid meta and farm the heroic bosses for gear that you need in order to take out that next heroic boss.