Well, if you guys want tips vs some of these characters, Im happy to help. Sorry if I offended some of you, I was just curious on what aspects people were having trouble with. Honestly though, I dont think that fox has any terribly difficult matchups. The differences between him and a project m made character is that he relies more on adaptability, since he has tools for every situation. Here's some tips for some of the tricky matchups:
Vs Falco- This isnt a terrible matchup once you learn it. Try to stay away from flat courses, and try to use the platforms to avoid lasers. Only rush down if you have momentum going, since falco can punish a missed edgeguard with a spike or a whiff with a death combo. Keep trying to screw up their stage positioning, because that is falco's forte. You can do this easily by using up throw into upsmash, then continuing to tech chase with up smash. Also, near the edge, try to use the shine to push falco off the course, because his recovery is absolute crap and extremely easy to hit, especially with some of foxes high priority attacks. Keep trying for the jab reset from shine. It'll only work about 10 percent of the time, but if you play it right it can be a free stock. I dont understand why so many people have trouble with him. He's not broken or anything, nor was he in melee. On top of that, both of the starfox have worse upbs than melee, which effects falco more, since he already had poor recovery. Against him, just try to play off his obvious weakenesses. I think this matchp requires a lot of experience though.
Vs sheik- Rush down works best. Against her and some other heavy characters, you should be focusing on heavy shine combos. Whatever you do though, do not let her bait you near the edge. She can easily gimp fox, since her recovery is pretty much invincible and her aerials have large ranges with high priority. Try to see how often the opponent crouch cancels, since sheik can do this extremely well, and punish with a grab or a dsmash. If they crouch often, use more dair instead of neutral.
Vs Dk- Pick a platform course. Against him, it is extremely effective to use complete aggressiveness, especially since the new shield system is in favor of foxs pressure. Be careful of CCs into grabs. This is an extrmely fast paced matchup. Both characters get destroyed by the other. When you dont have momentum. take advantage of dks slowness and try to get a couple of lasers in here and there. His vertical recovery is pretty terrible as well, so its easy to CC at low percents into shine at the edge for a quick kill.
Vs Marth- Depending on how the marth player plays, you will need to adapt accordingly. This matchup requires a lot of experience because of how versatile marth is. Try to choose a platform course so you dont get chained grabbed, but at the same time watch out for his fsmash range, since it goes through platforms. Against him, you will either be staying away and shooting, or pressuring the hell out of him. Theres not fight for space, since he controls it a lot better than you can.
Vs Jiggs- Stay away and shoot, be careful and make sure that you dont get baited for a grab. Try to tech chase her after shines either into a upgrab-uair or upsmash. Both kill her at low percents. Try to stay away from large border courses like dreamland.
Against heavy characters, it's best to work on tech skill like shine combos. Against lightweights, its better to keep pressuring and finishing with ugrab or upsmash.
I hope I didnt offend anyone on this thread. I think im more of a melee player, and sometimes I forget that people dont only come through this game from melee. Ive got a lot of experience with fox though, so if anyone is curious on any matchups, I'll be happy to help.