Part of the issue is that LFR itself is a snake eating its own tail: It has the perception of being faceroll easy, so people go and figure they don't have to really try at all because it's just LFR, so they do a half-assed attempt and likely wipe, which causes people to rage because they are wiping on "faceroll easy" content. I wholeheartedly think the issue is people that are lazy and figure they can just put in a minimal attempt because of LFR, and when you have an entire group that does this (more common than you think) it turns out that it's *not* faceroll easy.