I don't think anyone is debating that his E needed a nerf, but rather, they're upset that he didn't recieve significant compensation for the nerfs, nor the removal of DFG.
It's frustrating when Riot goes from one extreme to the other. The Ahri buffs were way over the top, and now the veigar "buffs" actually made a bad champ even worse.
If he's truly supposed to be a Support than I hate his passive. It'll be a huge noob trap. Every game bard will run off chasing shiny things while his ADC dies trying to to trade 1v2.