So in reality there are even more?
Lets not dwell on specifics, my point was that a huge number of people is clearing naxx fully and it will be the same for TBC.and on top of that many guilds have a "false" higher progression due to having members participating sometimes in PuG with more advanced guilds (I know several of the casual guilds on my server which are shown with a progress that I found weird, after checking it's just their more hardcore members participating in other events, while the main guild isn't even raiding Nax by itself, for example).
I don't have a problem with people calling it challenging, I personally don;t but it doesn't matter.
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Compared to other classes?
Bad.