E Range doesn't matter due to the drop delay (Probably won't hit) plus Veigar has low MS and no movement abilities, just how is he supposed to chase even farther (to make the E range usable) to then setup a 1.25s delayed meteor that has an even lower chance of hitting since the target is likely still running around?
Q damage was not changed AT ALL, and since everyone maxes Q first, the CD on Q that you will experience in game will quickly become higher than it is now. Also, as a skillshot it's even less likely that you'll hit your opponent with it because, once again, your probably not going to able to actually stun them. The only way that this Q change is possibly a buff is if you can consistently setup a minion kill + enemy champ hit for harrass. Finally, the Q farm argument is highly situational. Veigar cannot one-shot minions with Q until later in the game. This means that to make the Q change useful at all he has to prep the minions and then move into a position to hit 2 minions at once while both are at lower health, which is fine, in a bot game maybe. Against oppenents? If your not Q harrassing them, then they're at full health and will be ready to aggress on you, you won't have the positional freedom to line up minion Q-shots and with your E delays, you have a much lower chance at stopping them from walking all over you.
R is straight up nerfed. No compensation anywhere, just nerfed.
TL;DR: Nerfed through loss of DFG. Changes further nerf all reliable damage output scenarios and CC effectiveness. Veigars 'fantasy' is now tied to farming all game like a Nasus chained to his tower, and dreams of always hitting two champs with every Q.