Veigar is in a good spot after the most recent patch.
I've played quite a few games with Veigar since the most recent patch and have been doing consistently well with him! I feel that since they adjusted the cast time on his E that it's much more reliable and quite like the pre-nerf except now the enemy can see where it's going to pop up.
I've been able to consistently land his E with adjusted positioning, yes it's a learning curve but it also makes him alot more fun to play agaisnt as you actually have a chance to counter him, I have no problems landing a good W either so I really do feel he is in a good spot. The only gripe I would have is that I feel his Q range should be increased by about 50 and he'd be in a perfect spot!