"Rogues should be...well, rouge-like."

I'm not sure I can agree with this. Quite frankly, in PVP, a red rogue is a dead rogue. :P

On topic, I'm not sure what I want my armour sets to look like. These three paradigms you've listed all can work well, and can provide the art team with nice inspirations to draw from for each class.

But really, I just want it to look good. I'm well aware that what appeals to me is by no means representative of the community as a whole, or even anyone else for that matter! But for me, that's what it boils down to. You can have the coolest concept in the world, but if the execution is poor, those cool ideas have gone to waste, and we're stuck wearing ugly.

To be perfectly honest though, I'm pretty easy to please. I can usually see redeeming qualities in armour sets that have the general wow forum population ranting and raving (not that it takes much :P) I definitely hope the rise of transmogrification means that the art team can be a bit more adventurous with some of their future designs. I think DKs in particular could use a bit more variety in their tier sets. Skulls and spikes, anyone? There's gotta be more than that! :D