User blog comment:Kashicorn/What champions do you think are OP?/@comment-81.83.34.61-20121102045940/@comment-4022742-20121104122454

You, Sir, are incorrect:
 * "Galio channels for 2 seconds, taunting nearby foes and reducing incoming damage by 50%"
 * "Amumu entangles surrounding enemy units, dealing magic damage and rendering them unable to move or use autoattacks for 2 seconds."

If what I understand is correct Thornmail's damage is calculated by the damage you take before armor is taken in effect, but the 50% damage reduction from your ult still reduces that damage... letting Thornmail do only 15% of the damage dealt to you. Not worth it IMO

When facing Nunu there are lots of carries with their own blink or dash. And using exhaust on Nunu to be able to ignore him is not uncommon.

There is something like the summoner spell flash which you would also use on Galio. The difference is that amumu can:
 * Flash in.
 * Ult.
 * Get in position to damage the carry.
 * Toss Q when they flash.

Ultimately when you compare just Galio and Amumu's ult in team fights. Amumu's turns out to be better since it allows Amumu to still move and position + auto attack, where as Galio still takes damage Cannot move or cast and can just be silenced or stunned from outside the ult radius to be broken. (or when facing Garen or Udyr even from within)

There are only 2 things that galio's ult does better. Damage, and the balling of melee foes, to set up ult chains with champions like Oriana and Miss fortune.