He just isn't that good. He is the most overrated non-celtics on this site.
He isn't that good of a shooter. He isn't that good of a defender.
He is basically a more expensive version of Scali.
In Scal's best season with the Nets, he averaged 6.3 points, 4.5 rebounds and 1.6 assists. Last season, Barnes averaged 8.8 points, 5.5 rebounds and 1.7 assists.
So yeah, Barnes would be the equivalent of the player Ainge thought he was getting when he signed Scal. Which means he'd be significantly better and more productive than the Scal who's actually played for Boston.
Mike