Convert to sheetmetal, why such odd/large corner geometry?

Whenever I use the "Convert to Sheetmetal" feature, I get odd and large corner geometry.  Unfolding it and trying to add material is a PITA sometimes.

Is there a setting im missing or is this feature not very good to use?   Attach is the part I am working on, it consist of 3 different angles.

FYI, im using SolidWorks 2009.

SolidworksSheet Metal