well the thing with heroic modes in toc is...there's only 5bosses. i mean, 3.2 overall is for the most part something to keep us going until ICC opens up. and i thought the concept of heroic instances was better then heroic modes in ulduar. but what people should try and see is blizzard was just testing the concept of hard mode instances instead of hard mode options in "normal" instance to see how we liked it over the "option"
i believe it was made to stop the "well we wiped a few times on this hard mode lets just say fuck it and go normal mode" that was happening in ulduar.
what i am trying to say here is TOC was blizzard testing a new concept like sartharian was made to test the original thought of hard modes. when ICC comes out i bet the heroic version or hard modes will be better tuned and much more different compared to TOC normal& hard modes. well most of them probably, probably on par with ulduar's verity