Lets talk about LFR for a moment. I'm sitting in one of the wings of SoO waiting for it to actually start because the instance kicked off with both tanks and 4 of the healers immediately leaving before they finished zoning in. After some queue shuffling there is one tank (paladin) with 456k hit points, but also a shaman healer with 296k hits. I decide to check out her gear and low and behold we have 372 rings, legs and bracers plus a smattering of 410-420 blues. Of course there is also Hellscreams Warmace at 561** but that can't by itself be getting this person into the zone... so what the fuck??
Some of the problems with the game you can blame on the playerbase, but other elements are entirely preventable with more sensible matchmaking. Surely some intern at Blizzard is compiling the statistics on instances initiated vs activity and noticing these things?
** Mace has had its Spirit reforged to +hit because... I have no idea. I'm guessing this person doesn't know how Spirit works in a hybrid dps even though it happens to be playing a healing spec?