Veigar old E only stun 2.5 seconds.
The new one basically stun 3 seconds and denied all dash ability. Like you removed every possibility to counter play his E. 0.5 second is not enough for players to doge his E instantly. And even you use a dash ability, you still stuck there. I'm not saying veigar is strong, but is E is insane broken, a team stun must be more carefully to be used. I love the old one more cuz it really take skill to use.