I wouldn't call it entry level content at all, it's probably the meat and potatoes of the game for many folks, considering how often it can be run at + level.
Oddly enough I wind up forming my own groups more often than not, as it's rare for my small guilds tanks to be online at some of the hours I play. For non-key mythics, I set the ilvl to 840, purposefully hoping to catch someone who's a bit lower, and I can't recall the last time anyone even signed up who wasn't under 860.
Anecdotes being what they are, I just don't see many in-game examples of people being hung out to dry.