When I first started playing TF2 the damage modifier for range didn't quite compute in my head. Since I'm blessed with twitch reflex and accurate hitscan, I couldn't understand how I was getting owned so hard with every class.

Once I fell for a sticky trap, I switched to demo and began spamming until the ammo ran out. It was like a basic understanding of the core concepts of this game, an ah-ha moment that is rare in one's video game career.

Soon I was living long enough to recieve ubers, and incedentally causing enough damage to suffer them. I've been pro at Steamroll Fortress ever since.

P.S. Anyone who thinks they are 'good' at demoknight is just a well equipped lotto.