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I'm really happy that it looks like Photoshop and not like GIMP. Good UI is essential for widespread adoption.

It's necessary, but not sufficient. Look at Microsoft Blend for Visual Studio (formerly Microsoft Expression Blend), for example.

I don't think it was such a bad tool, it just targeted a dead-end platform (Silverlight)

And a not-so-dead-end platform (WPF).

Well, that's been killed off too effectively. All focus is on WinRT (that hardly any are using)