I predict that Veigar will be the next champion on everybody's "cancer" list

If it's one thing I learned from pre-nerf Leblanc

from Warwick from pre-chain nerf Ziggs from pre-FOTM Zilean from pre-FOTM Syndra etc.

is that the only thing that stops champions with extremely toxic kits from being hated by the community is that they are severely underplayed. For instance, nobody discovered that Leblanc was highly cancerous until a pro played her.

I think Veigar should be reserved a spot for having one of the most cancerous kits.

Yes you can harass him early game and yes his level 1 trade is pretty bad. But the problem with Veigar is that he is an extremely all or nothing champion, in that, when the conditions are right for him (i.e. when he stuns you), he will nuke you INSTANTLY with no retaliation. And on top of that, he scales with AP infinitely, has a built-in Athene's, and scales off of the enemy's AP.

Playing against a Veigar requires you to cross your fingers together and pray to god that he doesn't stun you. Because if he does, then you're going to be stunned for a very VERY long time, during which he'll throw immensely powerful spells at you until you die. That is the definitely of anti-fun. His stun range is very long, very hard to predict (because it's not a skillshot), and lasts for 2.5 seconds long.

Playing against a Veigar is like playing a game of "dodging the box edge". If you dodge it, great. If not, you'll die, he's going to get fed, and he's going to kill more and more champions with that box. Don't forget that Veigar has the amount of burst that would make even Syndra jealous.

It's no fun at all when your laning phase involves you hoping that you're lucky that you don't hit the box perimeter, and that you're going to be punished with your life for hitting it. Don't forget that it's not a straight line skillshot thus making it very difficult to dodge.