This is one of my biggest pet peeves. You drafted the guy 15th overall to come in and start right away. If you didn't, then you shouldn't have drafted him in the first round. End of story.
More simple thinking.
You are assuming that there was someone else on the board that the team though could come in and start right away...and you are assuming that the team doesn't think that way about Vaccaro.
In the end, if Vaccaro becomes a pro-bowler, but doesn't start until year two, it would be idiotic to call it a bad pick.