It's anything but a secret that Bush and Schroeder didn't get on well. The problem with Merkel is expectations: They already are so high, she may not be able to meet all of them.
There is no question that Washington is meeting Angela Merkel with a positive bias following the conflicts with former Chancellor Schroeder.
If there's any prejudice regarding Frau Merkel in Washington, it's positive prejudice. Expectations are so high she may not be able to meet all of them.