this...thats what i am sayingTBC had the best 5-man model by far, making them very challenging and yet very rewarding. Back then these blue items were the ones that prepared you for Karazhan, Karazhan prepared you for Gruul, a mix of both prepared you for Maggie, when you got a little further you got to do SSC + TK, and after farmed these Hyjal + BC. But I think I'm going offtopic here, just saying TBC dungeons were amazing.
I don't really mind that they reused their artwork, I pretty much came for the challenge and loot anyway. MoP 5-mans may look pretty but are completely awfull, the blue items don't feel rewarding at all and you steamroll trough the place so badly.
So what I'm saying is, I prefer MORE 5-mans with reused artwork rather than a lot less 5-mans that may look prettier. And ofcourse more challenging