I was literally just about to make a thread. I doubt I play as much nidalee as you (I only have 30k), but I play a fair share, and she's one of my favorite champions.
Personally I feel one of her major issues is that the speed buff on her hunt passive is too low now that everyone gets free movespeed from items and most champions have something in the way of mobility. Personally I've been having a lot of success with stormraiders surge.
As for actual kit issues, w needs some touchups, even if it is as simple as a stun.
I also feel like adding back the movespeed and ad buff to cougar form could be nice, or a Cassiopeia like reset on her cougar e on hinted targets, but in exchange q now consumes the hunt mark. This would really help her in her get in, kill, get out play pattern, whereas right now its more like get in, almost kill, die trying to kill or leave before you die.
Another thing that's always been weird for me is that level does affect her cougar abilities, yet they are unavailable until leveled up. I think it would help her if her qwe cougar form was all abailinle from level one. It might be a little op, but its not as bad is if say, Elise had them all.
All that said, this thread will never get any attention because people have such a hate boner for nidalee, even though she's been trash for a while now.
That wont stop me from playing her tho
Also, on my phone so sorry for any errors