He's the best of the Links, although it's close between him and adult Link imo.
His KO power is a bit below average but sufficient enough. Love comboing from bombs. He's got tons of traps into fair or dair which end stocks like nothing. I used to secondary him in Melee and I can tell his ftilt got nerfed in terms of power, but it's still pretty fast and reliable. Fire Arrows are still as good as they were there and boomerang is obnoxiously good at controlling space. I really like his nair too, much more reliable than Tinks. In fact his movement physics are much better as a whole than Tinks.
He does suffer from having bad recovery, and his moveset, although fairly quick for a swordie, lacks range.
When I play him I have a rough time mostly against Fox, Pichu, and Pikachu. I feel these three are his worst matchups, although they all feel doable.
I'd be surprised if he's anything below high tier myself. I'd say High tier atm since he lacks the results, but just looking at him he's no way any less than high.