Too true. Currently I find my alts get to end game level, I look at the "generi-junk" sets that are poops up LFR loot tables and...I just don't see the point of even bothering.
Whereas when you have a unique class themed set to farm, you not only want to gear up, but you also have a desire to continue farming the pieces that match your set.
I think WoD has proved the experiment with changes to the LFR loot table were a massive failure and I for one am glad to see the ass end of them.