Dragonhaven? Interestingly, I far preferred the style and tone of that one to that of some of her others; I think it might be my favourite. The voice struck me as very real. But to each her own. Out of curiousity, what did you see in it that you considered poor writing? 

Don't read Sunshine, though. Seriously, whatever you do, do not read Sunshine. Can't stress that enough. You don't want to be reading Sunshine. It contains content unsuitable for children or other life-forms. I loved the worldbuilding, but my word whose bright idea was it to shelve that in YA O_O I couldn't finish it, and later found out that the author herself describes it as NSFW, which it indubitably is.

I liked The Outlaws of Sherwood, but I will never forgive her for the ending. That was not a happy ending. I don't care what she says; that was not a happy ending. It was horrible and made me want to throw the book at something. So I hate the book. ^_^

Beauty is <3, of course. It was the first of hers I read, and I still love it. And it's been quite a while since I've read Spindle's End, so I can't speak for that one much, but I do remember enjoying it quite a lot. 

I'm soon to begin Pegasus, which looks excellent. (and it has the most gorgeous cover evar)