1/17 from 3 is almost inevitable if you take them in the sorts of numbers that Harden does, for a long enough period of time. So you have Curry going 0/11. That's bad in isolation, but not in context.
Harden v Kobe is a great summary of why comparing stars across eras is so hard. I don't think Harden could have done what Kobe did. I think if he'd come along 10-15 years later, Kobe would have had a decent shot at being as good if not better than Harden. But if you put Kobe as he actually played on the 2019 Rockets, they probably don't make the playoffs.
One of the most interesting things about Harden is that he's not a great shooter in any conventional sense. 85.5% FT, only 36.5% from 3 for his career and 37.5% this season. Curry is making more 3s on fewer attempts so it's not even that Harden is freakishly accurate for such a high volume shooter. His outstanding attributes are really his foul-drawing ability and the step-back. A lot is made of off-the-dribble shooting prowess but if a team can reliably create an equally valuable shot by running someone off a screen, does it matter whether it's off the catch or the bounce? If that's true, then really Harden's brilliance is in drawing fouls, which is entirely a product of the way the game is called right now.
I think Harden, really, is more a product of the specific era in which he plays than almost any other superstar we've seen.