I only play offline with Real Shooting % and slightly modified All-Star sliders (I think my 3PT point is 47 or 48) and I was pretty happy with my shooting percentages in my first season.
Stats:
Some players are obviously way higher than real life (Smart & Green) and some are way too low (Bradley & Jerebko), but with things like shot selection, usage rates, training, etc. factored in, then I think we're pretty close to real life overall.
edit: I should say that I don't play every game - I only play around 20 in full, but do intervene in a lot of games. In the games I've played in full I've shot as low as in the teens and as high as 58%. However, most games are in the low-to-mid 30's.