How about the same kind of loot it's been dropping since they implemented it? Not this shitty looking, no set bonus having garbage that they introduced in MoP. And it's not "free loot", you still have to run the thing 50 times to get the loot you need. Free loot is Tanaan Jungle were you kill mindless shit for a few days and get better loot than killing raid bosses. MoP had it perfect, WoD got it wrong.
LFR should be no different than Normal, Heroic, or Mythic. Everything should be a tier down just like the rest of the raid tiers. Acting like it doesn't deserve it because it's for "bads and casuals" while simultaneously praising the fact that an open world zone drops better loot like candy is backwards as fuck. As easy as it is, it's still far more time consuming and difficult than running around soloing mobs out in the world.