Yeah, that's how it seems to me too - that Barbosa is not a very good PG. He's a brilliant scorer, but I've seen him make some terrible decisions with the ball in this series (particularly end of game 1 and last night, and a few times in between).
On the other hand, the Spurs have a PG who is a decent defender, but unreliable shooter, who has also made some terrible decisions with the ball.
I don't understand what happened with Marcus Banks. Kid has a lot of potential from what I've seen, with the right coach.