NOT THAT GREAT???????? THE ABILITY TO TURN AN AD CARRY INTO A SUPPORT FOR 2.5 SECONDS ISN'T ALL THAT GREAT???
sry, exhaust fanboy

Tell me, do you exhaust the AD carry at the start of the fight, so his front line can protect him, derp around poking while the exhaust worn off, of do you exhaust the AD carry after half of his initator are dead but he's done massive damage?

Your team can force a fight after exhaust, true, but then good team would have some anti initiate mechanics or at least will know to back off for 2.5sec

Exhaust is awesome 1v1, don't get me wrong, especially against trondamore or AD yi, but in a teamfight, sometimes ignite cutting out sustain from certain champs is more useful.