Not a Fox main myself, though I've been thinking about picking up Fox since he seems to do insanely well against some characters.
What are Fox's bad MUs? While I do play characters that go neutral or not too bad against him (Pac-Man, Ness, maybe Mario specifically) a lot of good Fox players pretty much everyone can give me trouble once they start reading what I do and react accordingly. I swear to god you ****ers are like robots when you react to ****, that ****'s almost perfect.
The key to fighting Fox is to not over-commit with a move. If you do, you're leaving yourself open for Fox to punish you. The same applies to fighting Sonic and fighting Falcon: don't throw out attacks that leave you open for too long.
Fox's neutral game is fast and let's him run in and quickly punish, but once you get a hit confirm on him you are quite capable of pushing him offstage or possibly end his stock. It's the drawback we get of playing such a fast character.
Based on what I think and other Fox mains say, Fox's worst MUs:
,
,
,
come to mind, these are either close to even or bad for Fox.
before the patch, I don't think he's bad anymore though.
Should I just give in and play Fox more so I can perfect him? How should I deal with Fox? What are his best customs, by the way?
Fox's customs depend on the matchups.
Laser1 does its intended job well enough of forcing approaches and tacking damage. Good vs Villager, Mario, etc. characters with reflectors or absorb moves.
Laser2 is the Falco/N64 blaster, and is good for better ranged pressure against characters who can't do much about them.
Laser3 fires a powerful charged shot that travels at a respectable speed and decent distance. It's not as effective vs characters with reflectors, however.
The choice between SideB is Fox Illusion or Wolf Flash. Fox Illusion is the straight default one while Wolf Flash is literally the same as Brawl: both have uses, imo both are preference based. Illusion can combo into Up-airs, B-airs, and other aerials, while Wolf Flash has the meteor at the end that gives Fox a way to KO offstage from the bottom blastzone.
UpBs is between Flying Fox (2) or Twisting Fox (3, or Barrel Roll). You should use UpB2 if you want to make it back onstage as fast as possible, or the Twisting Fox for some nasty KOs at low percents. You can use its multiple hitboxes on start-up to trap opponents as well.
DownB is Big Reflector (2) or regular shine (1). Big Reflector has a windbox which makes pseudo shine gimping possible, while normal reflector is great against projectiles.