If you see a stat you don't like, you're just going to throw it out altogether. I get the motivation. But you've got to at least come up with a valid reason why. You seem to think that stats which don't reinforce what you already believe are useless. The whole point of a stat like WS/48 in the first place is to objectively measure players in a way that isn't influenced by your biases. A layup is worth the same 2 points as a dunk. A player who hits a lot of threes but takes a huge number of them may seem like a better shooter than a player who hardly takes any but hits them at a good percentage, but objectively he's not a better shooter he's worse and his volume shooting is compounding the problem.
I'm not intending to say WS/48 is the end all be all of the stats world. I'm trying to find a simple way to explain to people that what you think you see isn't always what's really going on. People have a tendency to be blinded by superficial qualities like freakish athleticism or size, degree of difficulty shots, and how many points show up in a boxscore. When you take all of that away you start to get a clearer picture of when those flashy tools contribute toward winning games and when they're just flash without substance.
For instance...
Trevor Ariza had three horrid seasons in Houston and New Orleans where he was playing on bad teams and expected to be a primary scorer. The rest of his career he's been a solid defender and an opportunistic scorer who maximizes offensive possessions by not trying to do too much. He was far and away Washington's best player in both of their playoff series this year.
Danilo Gallinari doesn't have a very good FG% on the surface, but his 3pt% is actually very respectable for his career and he takes nearly half his shots from that range. The result is an inflated TS%. He also limits his turnovers and boards well for his position.
You might think Mike Dunleavy was never that good to begin with and at 33 he's surely on the decline, but the last 4 years have been the best stretch of his career. Like Gallinari he's bumped up his efficiency by mostly eschewing the mid-range and taking 67% of his shots this season either right at the rim or from 3pt range. And he's been at or above 40% from three in 3 of the last 4 seasons.
Matt Barnes started out his career as a journeyman with no shot but he's worked very hard to earn his place and he's been an elite role-player the past 5 seasons for Orlando and both LA squads. How is he doing it? Like Ariza, his game is all three and D.
Josh Smith is consistently one of the very few players in the league who's near the top of the list in both steals and blocks every season. This past season in Detroit was by far the worst of his career which is probably why you don't think he belongs on the list, not to mention who ever watches the Atlanta Hawks, but since 2008 whenever he limits himself to less than 2 threes per game, he's been one of the most productive forwards in the game.
Maybe you should look at what the stat is actually measuring before you dismiss it completely. OPS in baseball didn't even exist until 1984. Batting average was all anyone cared about before that but in the last 10 years particularly OPS has become
the stat for measuring how much impact a hitter has on the game and it doesn't even include batting average at all. Getting on base and driving in runs is typically what wins baseball games (defense is measured completely differently in MLB so it's not really relevant here).
In basketball, games are won by hitting shots and limiting your opponent's ability to do the same. If you're elite at either one of those, you're probably a very good player. Rudy Gay for all of his supposed gifts is elite at neither. In fact, here's Rudy Gay's page on basketball-reference:
link. scroll down to the bottom of the page where they keep track of appearances on leaderboards. The only thing he's ever been elite at is staying on the floor and taking a ton of shots.
Small market teams have been successful in baseball by finding better and better ways of sifting through the mountains of data and identifying overlooked players who aren't out of their price range and by refusing to waste resources on "name recognition". More often than not, "name recognition" is a code-word which means overpaying somebody based on past performance. Even if we can afford to pay Rudy Gay what he wants to stay, it would be a monumental waste of resources to do so unless he undergoes a sudden career transformation in his 9th NBA season. Because at no point in his career to date has he ever performed well enough to justify making even $10 million per year. It's there in black and white if you're open-minded enough to see it.