I still need to chart his shots, but going off memory his misses were largely because of shot selection, off the dribble, drifting, behind the back, low percentage shots. When he was set at a standstill or catching off curls he was deadliest. This is a guy who from three shot 47.4% in euroleague and 44.4% in the ACB. And that's with wild shots and not a whole lot of attention drawn by the other players like will happen with the Spurs.
Reminder: Marco Belineli was a trashcan journeyman who despite his shooting skill and rep for shooting still didn't really deliver. Most of his career was under 40%. His best year, by far, was that first spurs season when he shot 43.0%.
Bertans ability to shoot coming off screens so well at his size could be a huge asset to the offense. Running him around in action when defenses should be great.
And the rest of his game isn't bad either.