I have run the flex for years and have found that 3 point shooting acumen is very valuable to my teams. As others have said, however, too many coaches will over-think this. I try to get good passing bigs and well rounded wings and guards. I'll sacrifice most on passing due to there often being a BH/PE correlation in players, and have found that that decision has hurt me in the past, so I'm going to look to recruit passing better in the future. But one thing that's been stated with which I agree is the three point shooting comment. I always have a few good outside shooters on my team, and my team almost always is above 40% on 3's.