That (not very good, but very dedicated) player was doing solid with Ness right?
They were spamming PK thunder on intensity 2.1 classic mode, I don't think that's a good indicator of the characters strengths.
I mean he doesn't even have a hit box anymore during his yo-yo smashes (not to mention the range on them is also awful), dair is awful, PK fire has massive, massive endlag, PK Flash still useless, PSI Magnet does nothing when you're playing against something with no energy projectile still, his tilts are slow and quite weak.
His disjointed hitbox moves (dash attack, fair) are pretty alright, but I wouldn't say there's much else to him.
I need more time with him obviously, but as a Ness Main for almost the entirety of Smash, he's very disappointing in this game, atleast initially.