I don't care for the passive change to be honest. It's a power spike that will feel the strongest in the early game and it does it by removing options. That doesn't seem to fulfill any of their goals for Cassiopeia, especially when it's replacing the one part of her kit that made her into a late game champion. It doesn't seem worth the cost for the weirdness it creates when Cassiopeia just has certain items in the shop always disabled for her.
But I like the W changes, the E changes make sense (although it seems like a much less interesting mechanic than the E reset), and the passive isn't really that big of a deal either way.