Of course MEta Knight was OP. I'm just saying a newer person will feel that mac is OP because he caters to him:
Ground game? check. Noobs are usually on ground
Air game. Nope. doesn't matter noobs don't use aerials well.
Comboed easily? Check. Lol, noob vs noob there are no combos.
Edgeguarding and followups? Like hell he does it well, he can only gimp himself!. But i don't need to explain this one
Recovery? there are what, 4 characters(doc, Ganon, Bowser without mashing and DK) that have worse vertical recovery? And noobs generally suck at recvering.
Spammable jab, dash and smashes. Check, check and check. Those are the moves noobs spam.
Survivability? Wait, what is that? A noob wouldn't survive long anyways!
You see, EVERY benefit Mac has caters to noobs, EVERY drawback are for thing noobs are bad at. Which is why in a noob vs noob scenario, Little Mac is light-years away from the others(and Wario is last because Bike SDs and weird attacks). So a starter has every the right to say that mac is OP, because at their level he's more broken then a million dropped plates. It doesn't make them right though. in an expert vs expert scenario, Mac is a solid character with armor, speed and power, but suffer from drstic drawbacks to more of an extent than any other character. He's not OP. But for a noob, he's beyond OP.