Thanks guys. Very good points all around!
The case that originally made me think of this was last night when I was looking through pictures of a trial I went to not too long ago. There was two dogs that I liked a lot upon meeting them, and then as the trial went on both dogs failed their tracking (one due to handler error), then went on to be mediocre in the next two phases (the handler that had the error got really pissed after the tracking, and remained that way, and I'm sure it reflected on the dog some). And recently I began to realize that if I try to look at dogs like I'm going to buy them or one of their puppies it helps me be a little more critical instead of just falling in love with every GSD I see.
So thinking like that, I began to second guess my liking these two dogs and began to wonder what everyone else would do.
I appreciate your feedback!
I am glad to see that there are people who would give the dog a second chance, but I can also see like Hundmutter said, there are cases when you need to see something every time. I don't imagine a prospective K-9 buyer would be willing to give a second chance to a dog who displayed something undesired the first time around.