So Right, But Yet So Wrong

After watching the clip from Order of the Phoenix that was shown on "Ellen" the other day I am, not for the first time, completely amazed at the absolute skill and insight shown by those who cast the Harry Potter movies.  Watch the clip below, and tell me how they could have picked a better Umbridge--really she's incredible.

That being the case, I must ask, again not for the first time, what the heck happened with Michael Gambon?  How can people so obviously gifted at their job have missed how glaringly horrible he is?