During his rookie season with the Denver Nuggets, Jamal Murray started 9 games.
In those 9 games as a starter, he averaged 13.0 points, 4.7 assists, and 3.0 rebounds per game in 32.9 minutes with a true shooting percentage of .519.
Using search parameters approximating those stats (>/= 12.5 pts, 4.5 ast, 2.5 reb, .500 TS%), this is the complete list of NBA guards 20 years old or younger (per Basketball-Reference.com) who had that level of production in their rookie seasons:
Murray is not, of course, on that list, as his numbers for the entire season were considerably lower (9.9 points, 2.1 assists, 2.6 rebounds, .518 TS%).
So while this is not to suggest that he had nearly as impressive or impactful of a rookie season as the players above, what it does show is that, in the small 9-game sample size of his games as a starter, he was producing on a level that, if he can sustain it going forward, will put him in some fairly respectable company.
It is also worth noting, that even as his minutes and production increased as a starter, his TS% stayed constant, which is a good sign that his efficiency will likely not drop off in the larger role he will certainly have next season.