Veigar still needs work
I'll be the first to admit his old E was overpowered if you could aim it well but what they've done to it (and the rest of his kit) has killed him as a champion for me.
Right now you can't use the E to stun which makes landing your W next to impossible and since the Q is also a skillshot you can miss that too. There are no ap gains from the Q change since that was always gated by the minions and mana, not the Q CD and since it hits two targets you end up pushing your lane...as Veigar whose only form of safety is a stun you can't land unless the enemy messes up (ie no reward for skill).
The removal of DFG and nerf on his R make choosing him pointless when other champs (primarily Annie) do the same thing as he does but better. She doesn't need to farm minions with her Q so she can trade in lane, she has a reliable aoe stun (That can be used to block skillshots), and has better AA range. Her burst is slightly less powerful than Veigars but only if he lands his full combo (and is against an AP champ) which rarely happens on your account.
Pre rework Veigar had an identity, rewarded skill but lacked counterplay. Now he has counterplay but no skill rewards and no identity.
's Mystic Shot). This makes dodging an unexpected Q challenging for most mid laners. Q changes now allow Veigar to be rewarded for positioning well and choosing to make intelligent decisions, and that for me is what makes LoL a fun and exciting game to play.