Fiddlestick is too risky to play now
Since other junglers were struggling before patch 5.5 Fiddlestick has been in a good place do to his infinite life sustain . Fiddlestick was never OP . He simply was not effected by Jungle damage amp therefor he was a good pick at that time .
Look at all the nerfs that were followed after new season . Its proof that Riot nerfed him in response of their flawed jungle design . Now that playing field has been more or less equalized are those nerfs justified ?
- Silence from E now only applies once . Without Ulti Fiddlestick is extremely vulnerable and this was the only tool keeping him relevant in teamfights .
- 10 MR reduction applies only after dealing damage . Since most champions have magic damage this hurts fiddle overall both in support role and teamfight .
- Range nerf on W . Keep in mind that almost every champion has something to counter drain not counting potential ignite and regen reduction . Any decent player will know how to deal with it so why was that implemented is beyond me .
- Smite charges . Although not a nerf to fiddle it hurts his early game do to easy invades which were common even before that . Fiddle is a counterjungle magnet .
Right now there are too many champions that will have an easy time playing against fiddle :

Although the recent Tank buff is a healthy change for the game it seriously hurts Fiddlestick pick . Fiddle's damage simply won't be able to keep up with 25% bonus life with combination of any magic resist .
If you reach a point in game where Fiddle only does damage to 2 champions (like AD and MID ) you probably going to loose because your hole gameplay is one lucky ulti that kills entire team . If you trade 1 for 1 its probably not going to go in your favor as other jungler will have more impact when you ulti is over .
I have 65% win rate with him after a 1000+ games between 3 seasons . I am not bragging but I do understand how to use the champion .
No matter how good I play him I feel like I am outclassed in champion select .