Do you find the current Veigar fun?
Simple enough question: Is Veigar enjoyable to play in his current form? I've ranted plenty at my disdain for the Veigar rework so rather than focus on his relative power level in the game, I'm going to focus on how fun (or the lack thereof) he is to play.
Cast vote now so you aren't biased 
My thoughts - I doubt it will surprise you that I've found most of the joy in playing Veigar gone. I can still get kills, still save the occasional teammate, still toss my ult, but the joy is just gone from these exchanges. For so many players the proper execution of your combo, the potential to 100-0, the ability to pull off that clutch play, these are what we celebrate. Since the Veigar rework, I just can't get that same rewarding play because you're stuck playing defensively the whole game and there is simply no way to control the outcome of your success. You can influence it, but not with with any true control.
Without a reliable stun, sure you might be able to poke with Q, you might land the occasional meteor (if your opponent fails), but outside of that you're left with relying 100% of your team to set up any kill. Sure, you can probably Flash > Ult + Q + Ignite and kill the occasional squishy champ but the rest of the time you are forced to run in fear until that magical moment when their brain turns off and they** let you ** stun them. Let's be clear, getting stunned is basically a choice for your opponent unless you are combo'ing with one of your teammates CC. Those moments, when once again you can do a proper Veigar combo, only serve to remind what we've lost and how gimped Veigar has become. As such, I can't even derive pleasure. I might get the satisfaction of the kill, but it is bittersweet and certainly leaning more heavily in the realm of bitter.
So for me, regardless of whether Veigar's win rate starts to level out or not, they've still reduced the fun aspect of the champion in my opinion.
Random: Watching the Patch 5.5 rundown was just painful / awkward as they circled the topics of both the botched Veigar rework and champ balance.