User blog comment:NicknameMy/How to be a Lifesteal Tank, the Sion/@comment-4881935-20130807175056/@comment-4881935-20130807191811

Let's recount everything you added to your Sion:
 * Higher Healt Regen (to counter act the health cost)
 * Removal of Mana and all Mana associated things
 * Serious increase in his attack speed and attack speed per level
 * Increase in his armor and armor per level
 * Increase his base movement speed
 * Passive now consistant and scales with enemy physical damage
 * Given Health ratios on Q
 * Given Health ratios on W
 * Increase free AD from E
 * Increase movement speed when R is activated when running towards enemy champion (closest one)
 * Decrease ultimate cooldown by 20 seconds.
 * Increase Aura heal range

Things you taken away
 * Damage from Q
 * Damage from W
 * All spells have health cost (5% current health, 1% current health, 10% current health)
 * Decrease duration of R to 10 seconds

Did I missed something, please tell.

But the point is not his burst damage. You just made his sustain damage so much better with the dramatic increase in the attack speed and free AD. You also improved his ability to stick to a target, while increasing his DPS, while making him a lot more tanky, and rewarding him to be more tanky.

So, in teamfights, all he has to do is reach someone and auto-attack them. His absurdly high free lifesteal, his natural tankiness, and his much improved DPS will generally keep him alive for any fights. If he doesn't get destroyed the early game, his only counter play is to just avoid him. That's not fun for any opposing enemy.