Playing AI may be fun, but its not good to judge balance, its not competitive, its not creative and 90% of the time its played on maps with many choke points which is simply a meat grinder.
Watching a replay vs AI is...a waste of time to be honest, you might as well use the time to play a game....even if it is AI.
The reason for posting replays , is to show some competitive gaming, innovative tactics...fun games where you outsmart your opponent etc. That's not what you get with AI matches. You won't really get tactics advice either...more like 'tricks' that work only vs AI.
So, as we originally said, this is only for human vs human games.