Yes, it's true, some matchups will be just as fine but many are going to be significantly harder to borderline impossible (7-3 or worse).
If you think 7-3 is borderline impossible, it's clear that you've never played an
actually bad character.
Here's my hint for all of your counterplay to Ness. If he's in the air, hold shield because his only option is DJC->aerial, and all of his DJC approaches land him solidly in range for a punish with the exception of a perfectly spaced bair on some opponents (note--if your Marth, don't worry. Your shield grab will still beat this out).
You mean when he's in the air, he's at a disadvantage? Like the
majority of characters in this game?
fwiw, you also have empty djc -> retreat (ie. waveland backwards into fsmash/dash attack/jump again + pkfire/whateveryouwant), empty djc -> tomahawk grab, crossup magnet into djc [any of the previous], etcetera.
If he dashes at you and gets close to you, he's going for a grab because he's got junk grab range.
If you're actually that predictable, it's no wonder you're losing.
Look, you could be entirely right -- it's possible that Ness is a bad (or perhaps even a
terrible) character in this patch. Regardless, none of what you're saying is indicating anything other than a straight up refusal to investigate options that aren't incredibly straightforward approaches.
EDIT: I'm also not saying that you're a bad player or anything. That's just what your words seem to imply. I'm watching one of your recent games now to try to get a feel for your level, but Winners Finals at smashing grounds is no joke. I mean no disrespect.
EDIT 2: EDIT BOOGALOO: Okay, after watching a couple games, I think I can see part of the problem. You're an
insanely aggressive player, which is fine, but it seems like you ignore a large part of what being aggressive in a game like Smash means: trying to create openings by baiting out unsafe commitments from your opponent. You don't do it much - instead it seems that you prefer to either
A: go completely ham and try to force your way in, train no brakes etc
B: hide behind PKF.
I mean, you don't really seem to use any movement tricks to bait stuff out (for example: jump in, B reverse magnet to hopefully avoid their attack into a DJC aerial of some type). You also don't seem to capitalize on the threat of the awesome spacing tool that is Ness's bat. Half the reason Marth's grab game is so vicious is because his opponents are necessarily scared of the sword; but you seem to ignore the bat entirely.
That said, I think you're probably a better player than me overall, so take it with a grain of salt. It's just that sometimes another pair of eyes can identify stuff in your blind spots, even if there's an experience gap.