I seem to be the only person who likes, and uses, the Wizard's Assault. Sure, it has longer start-up, and goes straight down in the air, but that long range and speed makes up for it (at least I feel that way). When people are trying to roll away from me when we're close, having the Assault helps a lot, as I can quickly and easily catch up with them. I don't know, I just really like it. It also seem to surprise my brothers and friends online as it has slightly longer start up but faster speed and longer range, something they don't expect. It also sends the opponents backwards which I feel is good, simply because you then have more time to recover without getting punished (since, y'know, you're sending them away behind you while you're still launching forward). It's also worth mentioning that it doesn't slow down when hitting, so it's more difficult to punish if someone shields it.
As for the other specials, I have mixed feelings.
Dark Vault is one I like, simply because of it's increased height and it's fast animation when it hits. Reminds me of Ganon's Melee and PM recovery :') Though I most of the time find myself using either the standard one, since it can grab and punch, or the Dark Fists because of it's power.
I also feel Flame Wave is really underrated. Sure, it has a lot shorter range and more ending lag, but hitting will deal a MASSIVE blow. The knockback is surprisingly good. If you're a good reader, I think this one is really good.
As for the punches, I mix 'em all up. The standard one because of it's damage and armor, the Blade because of it's range (and epicness), and the Thrust because of, well, the speed, and it is surprisingly satisfying to hit with