And for you the rework is fine. You're only looking at Cass as okay because she stayed the same for you. But Riot took half of Cass' player base and told them to try playing a new champion. Her early game is LEAGUES and BOUNDS worse than pre-rework Cass. You couldn't wihttle a champion down unless they openly waited for you to hit them.
Cassiopeia's Ultimate has a high shriek right before it actually stuns, that's actually plenty of time to turn around. I have never been caught in her ult other than a Ult/Flash/Activate combo which would then make it instant.
Her heal at 100 Stacks is a joke, it's so minute when you first get it that it might as well not activate until 250 stacks when she'll most likely have the AP for it to heal for more than a quarter of an autoattack.
Any person who has faced Cass once knows the downsides to the team having her. 1) She cannot burst down carries, so the jungler or top needs to become bursty. 2) She has no lane presence for the first 10 minutes of the game, so ganking for her will have a higher chance for failure and loss of experience while ganking against her has a higher chance for success. 3) She has mid ranged poke and melee ranged engage, so she loses to true Poke Mages and Engage Mages. 5) She has a slow, a haste, and a Cone Stun. Miasma expands over time, noxious gas is actually her only reliable spell, and Petrifying Gaze still has a 50% chance of hitting you if you turn sideways while being right on top of her will also prevent the stun.
So essentially by reducing her late game poke, and early game non-comboed damage, people are supposed to make up for her other weaknesses in Gold- MMR? It seems like only a buff for high ranked players, and not even all because several of the top users have been on massive losing streaks.