I'm confused as to whether you're talking about SL only or not. LJC hasn't even been on the team. He's a no-show by the very definition, but he's not a bust, which seems to be what 'no-show' means to you.
Cory is a serviceable guard who got a big contract. Very much a successful late first-rounder.
Anderson remains the most disappointing pick in at least a decade. Even so, there wasn't really a better player picked immediately after him. You have to drop all the way to 28 to find anyone established, and you have to go all the way to 40 to find a superior player at the same position. And that guy's a headcase.
Hill is still a solid starter and netted a lottery pick. He was insane value for the Spurs.
Tiago Splitter is the main reason Tim is still healthy enough to play. His was an awesome pick. Dude showed up in multiple playoff series and was the team's best overall defensive player until he got hurt last season. If Mirotic can be anything close to Tiago, Chicago would be ecstatic.
Mahinmi has a ring and is a very serviceable player in the league even after all these years. Not a horrible pick if they give him the time he needed to develop instead of stashing him then giving up on him. But still, there were a few better players who were picked immediately after him. It was a poor finance-motivated move by the team. Hopefully, Milutinov doesn't go the same way.
Udrih is also a player the Spurs gave up on too soon. He was never a great player, but he's still solid after more than a decade, and that's a of an accomplishment for a low first.
The Spurs don't necessarily click with all of the players they draft, but their ability to pick solid-at-works players with their late picks is extraordinary. You can even add Blair at 37 in 2009 to see how much value they get in that range.