As an athlete we are constantly being evaluated in one way or another, formal or informal. Fans watch game and mentally evaluate players whether they are aware of it or not, they decide who the best players are in their own minds.
There are many ways to evaluate players and I believe in watching yourself on tape and end of season reviews as two very useful tools. Watching game film after my high school football games always let me know what I could do better and showed me my mistakes, many of which I had forgotten or overlooked. I could watch myself and my coaches could also give feedback on the good plays we made and why we failed in other aspects/plays.
I also always appreciated meeting with coaches at the end of the season to "debrief". I liked the feedback that they could give me about the past season, and what they expected of me for the next year. I also like being told what aspects of my game needed the most improvement. It gave me something to focus on/aim for.
If I were leading a program (i.e. baseball team), I would implement both of these processes for reviewing athletic performances. These processes would provide a better view of the athletes than looking at statistics or a win-loss record as they only provide a snapshot of information about the season and athletes. These reviews will let the players know how they are doing, what they can do to improve and give them insight into why or why they aren't playing in the games. Also by reviewing film with coaches, a stronger relationship is formed between the athlete and their coach as they are both working, studying and trying to help get the most out of the athlete and their performance.