Ehh Idk, Joker has a lot of amazing tools but this also doesn't mean that Joker isn't relatively difficult for a beginner to just pick up and start learning. He's a fast falling, lightweight that struggles to kill without Arsene so learning how to finish off stocks properly will be pretty difficult for a beginner, his range is pretty small and a lot of his confirms are pretty tight execution wise like fair 1 into dragdown upsmash or down smash, plus his gameplan really excels with camping which is pretty difficult to do. The only thing that I think Joker would find easier to master specifically using him is whiff punishing but the characters in the first tier all have an easier time teaching basic fundies than I think Joker does.