Game Review / Theater Capability

I was thinking on it and I feel it would be a great idea to have a feature built in to the client to be capable of being able to rewatch previously played games, sort of like Theater mode from Call of Duty for example. If this feature was utilized it would allow players to watch previous games, learn their mistakes, and better them in the long run. Not only would it allow for that it would also allow for the addition of a more fan friendly community with them being able to mark certain clips or games that may have been really cool to show everyone the penta kill they just got. Combine these two pros together and you get a better learning experience in the game and a fun, fan oriented application to use outside of the game as well.