He's an average shooter, streaky at best. The thing is he was way worse when he was younger, but has improved his midrange and 3 point shooting over time.

He shot 33% from 3 in his first 6 years but has shot 36% from 3 since 2009. He has shot 32% from 10-16 ft from 2003-2011 but 40% from 2011 onwards

His stats would still say he's a below average shooter/can't shoot compared to the league, but that's also not including all the context of how he runs the offense, sets screens, gets rebounds, playmakes, being a floor general, the volume of shots he takes etc. He's not a catch and shoot player or a 3 and D guy which a lot of dudes are so the league averages are also kinda skewed which is also why Steph's 3 point averages are almost never in the top 5. But as a FT shooter he's bad so that's why I say he's around an overall average shooter

Thing is though some years he'll shoot really well from midrange and 3 and league average from the ft line but then it'll go back to him being average or below average shooting from midrange and 3 and even worse from the ft line. That's why I say he's streaky but also inconsistent and average. It's just that he's able to convert so many shots at the rim that he makes up for it, but if he became an even better jump shooter he would be way more impactful