Ill leave my two cent's even if it might be a little late:
I play a large amount of characters of the top 8 of melee's top tiers, so im relatively familiar with how basic match ups can go for fox. He wins them all, or goes barely even with only a few. Moving over to PM its more of a spread of "even" than winning for a bigger part of the cast. Now, people who struggle against understanding the neutral against fox, and cant reliably deal with his pressure often want him to be nerfed. Understandable, the melee edition fox definitely needed adjustments. He hit a little too hard, and had too many guaranteed setups. I think after removal of invulnerability from shine, and some percent reductions on kill moves, he was where he needed to be. To be real, a majority of the cast has some way or form to gimp, combo, chain-grab, etc. a spacie to near death on a majority of stages. If all you do is nerf a character that was pretty much what the bar was set for other characters to be buffed to anyway, eventually another character will become the "Fox" of PM. But remember, it took a long time for people to flesh out Fox to be the beast he is on multiple games. Luckily, with the last edition of PM being 3.6 (officially) the meta will develop, and people won't be able to hide behind the argument of Fox being "broken" or whatever they feel the need to call him. Honestly, it takes a relatively large combination of tech skill, and mind gaming in order to be victorious with fox. He is very give and take. If fox misses his approach, double lasers for too long, hits too high on shield, whiffs a grab, or almost any form of mistake, he can pay for it just as easily as any other character. So, I think that adding another 14 frames on the up-b was a little harsh. he definitely needed to be touched, but putting him in a situation where he basically is using an flashy side-b that leaves him with only the choice to pick where he'll take the risk is kind of overboard. I can't complain about the up-smash nerf, nor the jab nerf. Fox does have Up-throw up air for free on almost everyone at mid to mid-high percent. back air is still a good poke, and walling move, and the gun still exists, even if it takes more hits to add up for the effect it had in melee. 3.6 fox is like a modified PAL fox in my opinion, only the distance still keeps him slightly over that version. (Exempting the newly added landing lag.) No player is happy about their characters getting nerfed, but I think that maybe adding something that can at least attest to skill on the Up-B landing would've been better. maybe add IASA frames so you can at least move out of the animation, or attempt a block. I'd recommend shine, but its not invulnerable so the best situation is a trade. That's all speculation, and wishful thinking though. I think fox will still be top 2-3, but if this game stays as 3.6 with no surprises in the future, within a year a character will either be seen as better, or as good at the spacies. I believe that firmly. Also, to make a remark on how other characters can stand to fox now, if you go on Youtube and watch Lucky vs. Sethlon at the BOSS 2 tournament, it can show how sticking to a character, and learning to play against a player with your own knowledge of fundamentals, and even match up experience, you can overcome, or come close to beating fox. I was fortunate enough to commentate on that set, and it shows that if you stick it out even an amazingly strong fox like lucky can be challenged. I'll also add, that was one of the few larger scale tourneys in which a Fox has won PM next to when TSM|Zer0 won Norcal Regionals 2015 for PM. I talked on that set as well. =P So fox isn't dead, but the adjustments from the version he was may have been a little harder on him than I think was necessary. Also the reason I recommended those sets was for the version comparison, Zero was playing 3.5 fox, and lucky was playing 3.6 vs. Sethlon I believe. It's possible. Hard for everyone.