Lose lane report jungler has become the name of the game at practically every elo. I'm reading the comments, and most are from laners. So let me give you an explanation from a jungle main.
First of all, FF works only on a specific type of jungler: assassins who scale UP late game, benefit from AS ( usually build bork with FF), and can deal with slight mana issues (not talking about MadStone on this thread).
As a former top main (late S2) and mid main (S3) I make sure to know my matchups in the loading screen, and I will hover near the weakest lane ready to help. However, and this is crucial, low elo laners don't react optimally to your ganks. If you are Ryze top or Syndra mid, I fully expect you to enable my ganks. Otherwise, it's a waste of time to help and it could even cost me a buff or the dragon if I'm hovering near top.
I honestly hate to state it like this, but by picking a Feral jungler, I am intentionally choosing to adapt a selfish, hyperaggressive playstyle because I'm hoping to carry. I mained Xin Zhao to climb out of bronze and low silver by using an assassin-style build.
Lastly, as a note to laners, whining to your jungler that you just got ganked is not something you should do. If I'm feeling really nice, I'll donate a ward to your lane and even tell you to help yourself to my wraiths if you can't farm from being behind. If I'm not in a generous mood, I'll just ignore you and keep about my business. If you're toxic, you get muted and lose your gank/buff privileges. I'm not mean, I don't hate you, and I'm not going to call you names. I just don't have the patience to deal with you and I don't want to go into ragemode. I'm a person, too, and I'm playing LoL to distract myself from a stressful college life (math majors have loads of work).
TLDR play safe if you have a FF jungler, don't whine about getting ganked, dont QQ at me for your losing lane.