LFR and LFD are the 2nd two biggest changes to wow, led by Homogenization of classes/talent trees and followed by flying I'd undo from wow if I could.... "then"
I now like it. Here is why. I've been to damn near the top. (was #1 Priest Zul'jin a few years ago.... for ages.
I'm lonnnggg done with hardcore raiding, it was fun I achieved all of my goals sans a World first ( got like a 5th on Heroic Garajal or someshit)
Now I play casually, I don't even bother to raid, I could at the drop of a hat go farm farm content, and twards the end mythic at any tier. I don't. I'm kinda retired.
BUT. LFR lets me see the content. and gears me enough for the next PVE content release, or to go farm Heroic or some of the current M raid. IF I WANT.
I like it. and yes, I've played since the days of attunments and pre even LFR channels, when you would get a 5 man via trade channel or maybe watch general in Ironforge to take a trip to MC or BWL. the game is different now, maybe its me, or maybe its the ez mode instaint gratification FPS accustomed to new generation.
point is, alot of us use LFR, if you don't like it don't use it.