My Fox got owned by a Peach like that. I don't take it too hard though, it was in a FFA and a Doc kept attacking me while Peach was attacking which made me come 3rd.
Ya I once owned my friends (one used Falco and one used Fox) in 1 on 1's were I owned them as Peach. They were tearing me apart as Fox and Falco, and I pulled out my Link, YLink, Kirby, Roy, Mario, and Marth and they kept barely beating me. Do you know how annoying it is to keep barely losing until you drive yourself mad=?
I then pulled out Peach and I destroyed them (had 4 lives left in a 10 life game both times), and absolutely tore them apart. I countered there cheap grab combos with better ones, did attacks they didn't know, and found mind games that annoyed them, and that is how I basically won.
Ever since then I use her in rare situations, usually against ppl who think she is worse then Pichu, and just find so many ways to beat them. It is fun totally dominating ppl with characters they think suck, lol!
As for the whole Dsmash and Fthrow matter, I don't use the Dsmash as much as others do, and the Fthrow I totally use, though the Dthrow has some random neat combos I like to exloit. Also I like using her Sthrow a lot against walls so I can do my crazy combos. Then again, I annoy ppl with that with just about every character, lol!