Nate, Ike impress; Marvin, Darko disappoint

Stars aren't made in the NBA's summer leagues, but we did learn a few things in the last three weeks.

First, a caveat: When judging players, take summer league performances with a grain of salt.

Success in the summer leagues isn't a very accurate predictor of who will become an NBA star. While in previous summers LeBron James, Dwyane Wade, Al Jefferson and Marquis Daniels gave us early signs that they were ready to have breakout years, players such as Qyntel Woods, Willie Green, John Salmons and Zarko Cabarkapa have also dominated in these leagues.

A more accurate predictor is summer league failure. Nine times out of 10, it seems, if a player can't produce against the watered-down competition in the summer leagues, he'll struggle mightily to get it done against real NBA players during the season. But even that is only a short-term prediction, not a long-term one.

This year, the NBA held four summer leagues across the country -- the Reebok Vegas Summer League, the Minnesota Summer League, the Southern California Summer Pro League in Los Angeles and the Reebok Rocky Mountain Revue in Salt Lake City.

Who played well? Who bombed out? Insider talked to a number of NBA scouts and executives during the week to get you the skinny. Here's what the NBA Boys of Summer were up to in July.