Does An Author Changing Genres Make or Break You?

Most authors are readers, or should be.
So if you're here and you're one or both of the above, will you please answer this question? I'm very curious about the response.
Does an author you like turn you off when they switch/try out a new genre?
For instance, when Nora Roberts tried out the J.D. Robb thing, did you follow because she's NORA or did you try out J.D. having never read Nora (WHAT!) and now you do?
Is changing subgenres within a genre a no-no?
The thing I couldn't understand about ...