This is something I see in online communities so often - where people say that after reading their favorite authors book/ playing their favorite game/ etc., they stop liking other people's works. I just do not understand this at all. Brandon Sanderson's my favorite author, sure, but I still enjoy Rothfuss, Butcher, Martin, Lynch, etc.
Every author has their strengths and weaknesses. A Song of Ice and Fire's plot is a bit plodding at times, but his characters and world are still top-notch. Rothfuss's prose is beautifully written and engaging. The scope and depth of Erikson's Malazan series is jaw-dropping. To condemn them just because they don't quite fit your tastes seems a bit foolish to me.