A lot of the gear from classic, TBC and even WotLK is low polygon count with barely any detail at all. It's like being used to the detail in Pandaria's zones and then flying into Hellfire in Outland. Just looks like shit now.
I say, keep the more detailed gear coming. It doesn't need to get bigger necessarily, but it does need to get more detailed. Cloaks, for example, need a MAJOR overhaul. Some actual cape-like animations for example, not just some shitty looking piece of cardboard that stays stuck to your back like a strip of tape.