Calls for an "immediate impact" at CB through the draft. Do they make sense?

I'm all for drafting a corner but he would have to be exceptional to start and I just don't see any that are ready. If we are counting on starting our draft pick, it's going to be a long year. You only thought David was bad! What impact would it have on a young player to throw him in to that situation? I know everyone has to start somewhere but that could do more harm than good for the player and the team in the short and long term.