Old Morgana was simple and effective.
New Morgana is ... well ... kind of a chaotic mess. I love her spin animations for her Q and autos. It feels graceful and since I'm usually moving as I'm doing these things... well it's almost like dancing. I love that. Her W animation is great. And I love when she ults as it picks up those tail wings for a short moment. Seriously, her animations are just the best part of this VU.
I've played two games so far with her last night. Blade Mistress was excellent. Blackthorn was... well deleted. Let's just be honest. It's gone. I feel like it has been downgraded to a recolor. Like it barely holds on to the 1350 status because it does have different colored effects. Not saying that the old Blackthorn was much better. It's just this Blackthorn is a very different skin. I am eyeing the chromas for Blackthorn. Really looking forward to that.
I don't care for her Icon/Portrait in champion select/mini-map. Doesn't even feel like it fits the new Morgana.
I'm kind of meh about the tail wings. I understand thematically this is her choice. If she could have all her wings down/removed, she would. Part of why I enjoy the ult so much as it picks them off the ground. I would have preferred having the two wings parted more, though I suppose that might have made her look twin tailed.
Also don't particularly enjoy the over exaggerated facial expressions (though in game I'm usually too focused to care or notice her triple sized scowl/grimace).
On a whole, I do prefer new over old. Could it have been more to my liking? Certainly.