I think that's definitely true, but at the same time, it's difficult to be sure. You mentioned the Dallas example with Campbell, and that reminds me of when the Kings picked Jonathan Bernier in 2006 with the 11th overall pick. Fans and analysts were, for the most part, pegging the Kings to pick Bryan Little when they were on the clock. The pick shocked pretty much everybody, considering Bernier was projected as a late first-rounder, but Lombardi maintained after the draft that despite the fact that the Kings needed a goaltending prospect, and despite most analysts labeling the pick as a "reach" or a pick by need, that Bernier was, in the team's opinion, the best player available at that time. Now, four years later, Bernier is the best goalie in the AHL, one of the top goalie prospects league-wide, and the heir to the Kings' starting throne (sorry for the pun
).
Just to support what I'm trying to say a little bit, here's an article about the Stars' philosophy for the draft:
http://www.defendingbigd.com/2010/6/25/1536030/defending-big-ds-dallas-stars-2010
It's telling that despite Fowler still being on the board AND the team leaning towards picking a defenseman that they still went with Campbell.
As ridiculous as the pick seemed, I really wonder if the Rangers actually thought he was the best player available at the time. They'll either look like geniuses or fools down the line.