He's a good one, but that's still too early for a goalie. Remember, the risk with a goalie is not just that they're much harder to project and develop, but also that if everything does go right, they're probably not contributing in even a backup role until age 23 or 24. If your lottery ticket hits, you're probably only looking at a couple years as a starter before he becomes a UFA. With rare exceptions, you're almost definitely better off just grabbing someone that developed on another team's dime. Goalies rarely command a big return via trade, and that cost is usually worthwhile for a somewhat proven entity. Competent backup goalies are basically freely available at all times, and you can usually acquire a mediocre starter with some ease.
Basically, drafting a goalie in the first few rounds does not pay off unless you can find a real top flight guy who can start contributing early (Price or Luongo) or sticks around forever (Lundqvist or Rinne), or both.
I see the logic behind taking a flyer on someone in the 5th or later since players of any position drafted that late are unlikely to do anything, but I would argue that it makes sense to just not draft goalies at all. Divert the picks and scouting resources (evaluating goalies is so different from evaluating players anyway) and improve your own develop program by whatever marginal amount there, and then find other ways to stock the goalie pipeline. Undrafted CHLers, college free agents and European imports are all worthwhile routes for the pipeline, and as mentioned above, you can find a solid starter more easily through free agency and trades.
It's just so vastly different from other positions.