Arizona Cardinals head coach Ken Whisenhunt said this about OTAs (voluntary organized team activities):
"You're not going to make the team this weekend. If you want to make a good impression, don't make mistakes and do it right from a technique standpoint."
That seems pretty simple, but it is the attitude to have going in.
This isn't to say that they aren't important, because they are. They very important if the player is new to the team. A season ago, due to the lockout, the Cards had a locker room full of newcomers and they did not have OTAs because of the NFL lockout. That included quarterback Kevin Kolb, who will, along with John Skelton, battle this season for the starting job.
This also includes draft picks and undrafted rookies.
While fans already are set on seeing who can pull ahead in positional battles, these are not the workouts that do that. They can help, though.
Undrafted rookies can catch coaches's eyes and make an impression that will carry into training camp. Kolb and Skelton can show technical improvements, like footwork, timing and the like.
Bubble players from a year ago can show up prepared and keep themselves away from the bubble.
In a nutshell, the way OTAs go, final decisions are never made based on performances there, but they certainly can be factors .
You can talk more Cardinals over at Revenge of the Birds.