I'm currently working with Winforms for a project, while my background on .NET is mostly web apps.
I won't be as severe as Christopher Frazier, but I too am disappointed with the windows forms. Winforms don't work at all like webforms. I knew beforehand that webforms and winforms were not close in design, but this reality strikes me now that I have to work with winforms.
Also, when working with winforms, it's not long before bugs or rough aspects appear. The DataGrid control is a good example of this.
Like Christopher, I'd like to drop a "note to the windows forms team": Microsoft tells us to build smart applications, mixing winforms and web technologies. I think it's good, we need this. But you have to help us, bring winforms and webforms closer!