While I agree that baseball is better suited for statistical analysis (since, despite being technically a team sport, baseball is really a series of one-on-one competitions), I think there are stats that make an effort at capture such things, like Adjusted +/-, which gives you an idea of which players are having a positive impact or negative impact on the court (for any reason...if their leadership, floor spacing, whatever, is having an impact, it should show up on the scoreboard when they're on the floor).
Straight +/- is extremely flawed, since backups play against worse players and with worse teammates, but Adjusted +/- stats attempt to adjust for that.
PER is useful for exactly what it claims to be for: a measure of individual overall production. It doesn't claim to account for intangibles or for general defense. It's purely a production stat. You have to account, yourself, for defense or intangibles (if you think intangibles are a key aspect).