I've done LFR every tier in MoP on alts, in the beginning on my main too for the legendary questline etc. Groups always got better as time progressed, however it's been getting worse each tier. Lei Shen was already pretty brutal on LFR most times, people just didn't bother to learn. SoO is now so painful it's shocking.
Again, I don't understand why we don't get a minimal ability check before queueing LFR, a bare minimum of gating. I didn't use to care, and it doesn't affect my main characters, but I think it's such a sad trend and it's not helping the raiding community, in fact I think it's harming it by introducing potential new raiders to the content in a mindless, dumbed down fashion that actually intimidates them towards higher difficulties. I've seen newer players that did LFR try normal. It's not a pretty sight. They usually give up, because they were never introduced to how to actually play the game.