To tell the truth I've never worked with a larger pile of crap than WPF. It is a complicated, HTML duplicating, half baked, non updating, patterns over killing ... anomaly ... that provides zero productivity boost over WinForms and I'm still seeking for a cult that actually divides programming between a C# writing programmer and a XAML writing graphical designer. That'll be the day.
They should've detached WinForms from underlying Windows and extended it instead. WinForms is a result of three decades of event driven GUI development. Bloody Bill's Che Guevaras threw it away for a poor experiment in complicating what has already been simplified in the 90ties.