Burst vs DOT
Okay, I get it that having a champion burst down someone is a thing, but there should be a very definite risk for doing so ... if a champion does a full burst, and the enemy lives, then then the enemy's next DOT hit (or autoattack) should stun the first champion like crazy. In otherwords, if a Lee Sin attacks and you survive it, he is stunned for 2 seconds so his snowball melts like it is in the heat of summer. This should NOT apply to dot champions (Malzahar, Morgana, etc) that have to wear you down like crazy and have no burst kill. Syndra? her burst is epic, so should her being stunned if she misses it.
I'm talking about champions that if they hit you, the odds of survival are slim to none. Maybe it needs to be dynamic (okay, you took someone from 100 to 0 in < 1 second, you are now a burst champion regardless of what you started as). Something to counteract the snowball effect. I realize that those that play burst champions aren't going to like this ... but I think it would improve the game for everyone.