That's not the whole picture, though. Check his stats from the Spanish league (at the bottom of his wikipedia page:
http://fr.wikipedia.org/wiki/Nando_de_Colo). his shooting % are decent (or more than decent in some years). And re: ppg you can't compare Europe/FIBA games with NBA games.
With the help of Chip I see no reason why he couldn't get to the level of ~47% FG and ~38% 3P, which would be respectable.
Nobody said he'd be an All-Star, but right now he's steadily progressing towards a position in the rotation. And I'm quite sure Pop pays more attention right now to his D and court vision, which are much harder to learn.