I simply think he's not ranked very high because of a couple things.
A) His draft position, people get boners about our first rounders; but honestly, it's these guys that people wrote off/didn't notice who are making the biggest impact these days. Johnny Hockey, Ferly, Granny, Brodie & Bouma were all later picks that are looking to be real gooders.
B) His upside is that of a possible 15-20 goal scorer, 30-40 point power winger on the third line (think Glenny in his prime). It's hard to get excited over that, when you have:
Johnny Hockey (potential star), Bennett (potential Star), Monahan (20+ goals in his first year), Sven (has shown top 6 winger potential, in the NHL AND AHL) or Poirier (who was a monster in junior, and most thought he'd be looking for a job this year in the NHL level this year).
Then you factor in Klimmer, Wother, Gillies and our future HoFer Janko.