RJ seems to have improved his game since college. Scouting reports during the pre-season said that his team defense and efficiency have improved tremendously. His shooting will hopefully improve over time as he gains confidence and feel (whether or not he improves his form).
Some of the comps we hear are interesting in that many of them took a while to put up numbers in the NBA. Jalen Rose didn't really emerge as a legit starter until his 6th season in the league (age 27). Incidentally, that's probably when his jumper finally started coming together.
RJ's a very good athlete (he can make the highlight reel dunks and finish alley oops), but thus far in the games I've watched, he moves more like a veteran wing - he gets to the basket using a combination of deception, change of pace, and physicality. This contrasts to early career Lebron, who used his physical gifts (ungodly combination of speed and power) to get to his spots on the floor. As a veteran, Lebron still has a lot of his gifts, but is also more methodical. RJ, at age 19 seems to be a bit of a savant in that respect - some shades of Luca Doncic.
(It probably deserves a separate rookie watch thread, but it'll be interesting to see how this year's race shapes up. Based on my informal scanning of box scores, he had the best debut of the bunch. Among the others: Hachimura 14pts, 10rbds; Ja Morant with 14/4/4)