Top 5 best special moves.
Top 5 worst special moves.
Go.
I'm going to go with favourites and least favourites myself, so actual move quality isn't always the reason why they're ranked as such.
Top 5
Giant Punch: To store such power in your very large ape hands, capable of being unleashed suddenly and brutally whenever you desire complete with super armour, it's the SSB equivalent of the RKO, which is to say it's the thing out of nowhere victories are made from. Also a stored charge strikes fear into opponents so you can get that edge as well.
Flame Choke: Potentially Suicidal Chokeslam to hell, or amazing throat explosion, either one is a winner.
Falcon Punch: Of course, add a 180 twist while striking in the air for maximum awesome levels to be breached. Obviously Warlock Punch is great by relation.
Bowser Bomb/Hip Drop: Pure "whomp" power, nothing like crushing your opponent under your backside.
Charge Beam/Shadow Ball: Similar moves in execution, the reliability and power of the charge beam is nice but I do like the unwieldy nature of Shadow Ball and how it knocks you back a bit when thrown.
Honourable mentions- Confusion: It sort of sucks but I just find it so fun to use for unknown reasons.
Egg Throw: It's just so oddly satisfying to pepper people with.
PK Thunder: But only if you hit yourself with it and blitz through your opponent like a bolt of human carnage. Pika's thunder follows closely behind but isn't as satisfying to nail.
Tons more, mainly more situational ones like when you foil a Starfox characters recovery move with Mario's Cape.
Bottom 5
Force Palm: There's no force in this palm, I expected a crumpling palm strike of destruction, instead I get the most minimal of impacts. Also I have to mention extreme speed, it's neither extreme nor speedy and for some reason deals no damage, very much unlike the moves origins, but it's at least meant for recovery so grumble grumble.
Sleep: It's a guilty pleasure of mine but most of the time even if you pull it off they wake up as you're still singing away, I can't overlook such things.
Rock Smash: Charizard is a great big fire dragon! awesome! yeah lets give him ROCK SMASH! that patented signature move of Charizard right there!
Sonic's side B thing: It's like a spindash except it's not quite a spindash, why is this move even here? surely something better could've been used?
Angel Ring: HIYAYAYAYAYA! Pit already has the rapid a strikes and a reflecting special move, I just always felt this one was a bit redundant really, hopefully one of his many new tools will take over this spot for SSB4.
Honourable mentions- Stone: Every beginner ever, uses Kirby, spams stone, is elated if it actually hits but are puzzled when its predictability keeps getting countered, regardless they never stop.
Rest: Oh sure it's powerful but i've been part of far too many matches where Jiggs users spend 80% of the time bobbing around your head trying to pull it off (and usually failing), and what the hell does sprouting a flower or exploding have to do with rest anyway, it's just so bizarre. Saved from being part of the bottom 5 by being satisfying to actually hit and that the people who miss it become open for a huge wallop.
And a bunch of spin related moves, can't think of a move to fill out the specials? then spin, spin away! Some I do quite like, such as how Link (before Brawl) DK and Bowser can use them well for clearing the area when surrounded but on the whole they just feel so uninteresting, like you couldn't think of something more inspired?
I can't wait for SSB4, newcomer Little Mac, spinning punches recovery! Takamaru, whirling blades! and so on...