What you guys thought were bad:
zelda forward B - Can be used as a projectile, but don't spam it. I've Zelda players use this.
ness B - Edgeguarding. See some Ness vids.
ganon utilt - Edgeguarding as well, and to Cloudlockhart it is able to be used in singles. Can punish stuff like Jiggs's missed rest.
sheik forward B - Maybe edgeguarding, Sheik's worst move.
MGAW usmash - Lots of opening lag and small hitbox kinda... maybe against fast fallers or noobs in general.
peach B - You can use it once in a while to trick the opponent.
kirby down B - Fall faster to evade attacks, and you're pretty much invincible as you're falling.
luigi forward B - Recovery, and maybe the odd misfire kill.
bowser down B - Edge-cancelled down B.
ganon forward B - Combos into stuff, one of his better ground moves.
MGAW forward B - If you're losing by a lot this can save your ***. Just because it's not always applicable doesn't mean it sucks.
yoshi up B - Edge-cancelled eggs.
peach forward B - Yea, quite useless other than for wall bombing.
m2 down B - Can be used once in a while, like many other moves.
pichu forward B - Recovery.
ness down B - When there's an opportunity to absorb something and the opponent's far away to not take advantage of the lag, this is useful. It does happen. Also, you can counter noob Fox B spammers with this.
MGAW down B - Team battles, with your partner being Ness. Otherwise not always applicable. Does it stop horizontal movement? cuz then it might be a bit better.
MGAW B - Edgeguard maybe. Pan spike.
m2 forward B - This is the one with the pull-through-stage glitch right? You could use it for that I guess.
You guys should think before you say random moves which you think are bad. Most of these moves only have 1 use, but that's better than a move which is obsolete, like Fox's fair (his nair is better pretty much all the time... there is the occasional situation where you can get all hits in but it's still less useful than Ganon's utilt.)