If you kiddies really want a re-eval. The pick should have been Sengun. But take a look at that draft. Let me know if you need pointers on how to use google to find the information. The only other player that has been any good is Trey Murphy. Tre Mann has sorta been okay, but not really. It's legit a really, really bad draft from then on.
So... the Spurs actually did a pretty great maneuver taking a guy perceived to be later in the round higher, because the draft at that point was pretty lousy. Again, should have been Sengun. Murphy is a bit of a surprise, as he wasn't really that great at Virginia.
Again, to spell it out. Should have picked Sengun. Picking Primo wasn't terrible, considering. He needed work, but anyone at that point did and I wasn't writing him off.
What happened with him later is a separate issue than the draft pick itself. I suspect you know this but are pretending to be too stupid to understand.
Verdict: Sengun should have been the pick. Primo was not a bad pick there.