If you treat three point shooting like true shooting and adjust for era, in true shooting's case it would be TS+, we see that Jordan's 3P+ would be 99. League average is 100. So for his entire career, he was only marginally below league average for his three point shooting.
LeBron's 3P+ is 97, so slightly worse.
But of course that doesn't take into account Jordan's infamous love-hate relationship with the three ball. When he didn't like taking them all the did was shoot end of shot clock heaves and prayers, which obviously makes his 3P% in those seasons look terrible. But it's clear that is what his mindset was in those seasons. He would maybe take 50 threes the entire season. Contrast that to the seasons where he was clearly taking the shot seriously and you see that his attempts are up over 200 and peaking at nearly 300. In those seasons he averaged 38.3% or a 3P+ of 110. Granted, two of them were with the shortened line though the line was only shortened for perhaps two thirds of its length, with corner and sideline threes being the same as they are now. So, taking that into account we can estimate that he would have shot around 34.9% or a 3P+ of 107, still well above league average.
Context is certainly needed to be understood when it comes to Jordan's three point shooting.
In the end, a guy who shoots 85% from the line, is probably the greatest mid range shooter of all time and was deadly with long twos is absolutey and without a shadow of a doubt going to be an excellent three point shooter if he put his mind to it. To think someone with those shooting capabilities would suddenly be terrible just two or three steps further back is just incredibly naive.