For years I wanted a Looking For Raid feature, but IMO the implementation hasn't worked very well out to say the least. In fact, I believe it is driving players away from the game. The numbers may show lots of people are using LFR, but I doubt many of them like it. The new loot system, and the fact we're all funneled into LFR for tier gear and to complete our legendary quests has turned it into a disorganized zergfest and a trolls paradise. I have a simple solution to this. Hear me out.
(1) Give LFR a true Raid Leader, with all the power of 10m and 25m Raid Leaders.
(2) Implement some sort of ranking system for Raid Leaders to cut down on abuse.
The reason 10m and 25m raids work so well is because they have real raid leaders. Give that power to LFR Raid Leaders and we will make those work, too.
Raid Leaders would kick the trolls immediately and you'd see an abrupt end to the trolling. They could distribute loot using a simple roll system that would make the raid seem more like a "real" raid. They could take the time to explain the fights rather than deal with the gogogo-ers that currently dominate both LFR and 5 mans. Want to pull the boss before the tanks are ready? Get the boot. Want to go AFK instead of pulling your weight? Get the boot. Etc.
You'd be surprised how effective a real Raid Leader would be. They basically run the end-game of WoW, and that's why it's worked so well up to this point. I say give them the tools they need to fix LFR, or get rid of LFR altogether. In it's current form, LFR is a failed experiment. I fear Flexraids will just be more of the same.
People don't want to just "see the content." They want to RAID! And real raiding requires a real Raid Leader.