I'm not a Ryze player but...

I feel like they nerfed him too hard. Sure, nerfing his early game was needed because his laning was dominate, but they hurt his late game too. For those that don't remember, his last nerfs were:

Overload Base magic damage decreased to 40/60/80/100/120 from 60/85/110/135/160.

Riot's Reasoning for nerf: As a strong late game scaling champion, Ryze's ability to bully out other top laners early is pretty bonkers, so we're reducing his base damage in lane while still leaving his ability to scale past laning phase intact. We'll be keeping an eye on Ryze over the next few patches, however, as these nerfs might be on the light side for how dominant a champ he is.

If they wanted to nerf his early game, but keep his late game intact, shouldn't that have done something like:

Overload Base magic damage decreased to 40/70/100/130/160 from 60/85/110/135/160.

This way, he is still weaker at all stages until he reaches rank 5 of Overload. I know it wasn't too long ago that Ryze was dominate in the top lane so people may still be upset at him, but he's pretty much disappeared altogether. Again, I'm not a Ryze player, but I just thought I would point this out.