So to those who have been hating on Exhaust's resist shred

V4.13:

Damage reduction reduced to 40%, down from 50%.

Now reduces the target's armor and magic resistance by 10. 

There's where it came from. Killed burst too hard, but Riot still wanted it to be useful. And the attack speed nerf?

V1.0.0.108:

Exhaust now reduces (auto/basic) attack damage by 70% and ability/item damage by 35% instead of blinding for the duration.

That simply got unified. Originally it just blinded and slowed the target. Totally useless against spells. Should the attack speed and resist shred go live, then it looks like might be getting a new friend pretty soon.

Better solution?

Split Exhaust into two summoner spells instead of straight nerfing it. One a very potent move/attack slow and the other a nasty damage/resist nerf debuff.

And make Cleanse and Barrier worth picking while we're at it.