How to replay a League of Legends match?
You can record games with http://www.leaguereplays.com/
The LRF file just plays with the game itself. You can browse the match, but you don't have information your character did not saw during the game.
Besides those limitations, I think it is possible to record video of this with comments.
Hey, thanks a lot, it's really fantastic! I tried yesterday to record and replay a match and it worked well. The only drawback is that I didn't found a way to jump to a specific point in time.
It's not a perfect tool indeed. But a good start. Maybe they'll try to do better I do not follow the devs stages.