Riot. Listen to your community. Do NOT touch Veigar.
There are a lot of posts about how terrible this rework is. Here is another one.
The removal of deathfire hurt veigar. Im probably going to come off as dumb, but I never was a fan of the item. I know, I missed out.
I am unaffected by the removal of this item. And in all of my experience, I would often do really good without building it. I would still blow people up in the lategame.
Here is how I see it.
His new Q is a skill shot that hits 2 targets. I imagine that farming it will be awkward. Go to Q as a last hit, it hits another minion, and then you cant get that second one. This also makes it difficult to bully the enemy because he can dodge it or just stand behind minions.
His E is junk now. This how he was before. I would drop my E at it's maximum range and catch my opponent because they knew it was coming and were trying to get out of range. Most times, they run into it rather than me landing the wall directly ontop of them because it is so thin. This ability was also his only defense in lane unless he manages to bully the shit out of his opponent which is now harder with his new Q.
It has a delay and it gives a warning now. Enemies will just walk out of the way, many champions even have an ability that moves them.
His W packs a punch. But it has a catch, you can hear it coming closer and closer to hitting its mark and it makes a very noticable mark where it is about to hit. The target cannot be moving if you want to hit them with this. The only other way I can imagine it is putting it ahead of them while your allies chase him toward it so it is unavoidable.
I dont think Veigar needs to be touched. That is just my opinion because I never used Deathfires and I was happy with how he played.
Please riot, you listened when people were upset with Jinx not being pale as she was depicted in the videos and her splash art. Dont touch Veigar, I got his Final Boss skin and I dont want you to ruin him for me. 
:You think Riot listens to their community?