Great question. One could argue that Purdue is currently a top 15 program based on results the last ten years and significantly better than that based on regular season results the last three years (with one first rounds loss, one SS and one tbd in the NCAAT over that period).
The question is, how much of that is the job and how much of that is Matt Painter. Most basketball people would consider the job to be somewhere in the 5 to 8 range in the conference in terms of places where you can come in and win at a high level, behind MSU, OSU, UM, IU and in a group with MD, WI and IL.
I don't know whether that's right at this point or not. Certainly Purdue's attractiveness to recruits seems to have improved and the program has significant momentum overall. My sense is that the program needs a FF or NC to make that jump and be considered a tier 1 BT and national program outside of MP, but who knows.