I didn't say it "gets them off the hook". I didn't even say it was a bad pick. My point has nothing to do with the pick itself, only the attitude so many seem to have that Maybin wasn't considered a very talented player who was going to go fairly high in the draft (from what I saw, most considered him a top 15 - maybe as low as 20 - pick).
As for your point, teams whiff on pick all the time. It's certainly not a rarity. And Maybin hasn't even been given the chance to prove he's a bust yet! Horrible first year, but you don't judge a player off 1 year. Not to mention their next 3 picks were just as good in their first year as Maybin was bad.
So far things don't look good for Maybin, but he's about to come into his second year, going through his first full training camp, hopefully with better coaches (a big hope), and switching to a new position that on paper suits his physical make-up and talent better than DE did. Anything can happen.