When Ballistic was released I think I ended the season in like the top 2% of players with him.
Now that, I'd put a few steps above just "good" at Ballistic, very nice.
Another aspect of recording your gameplay is also purely for yourself. Middle of a game, you're observing teammates and worrying about your own gameplay. I'll watch back one of my games at times and notice I completely missed someone sitting right there or find the moment I made a bad call and it all went south.
Reviewing your own "tapes" can help quite a bit, especially if you're already pretty familiar with a particular legend.