If a blurb is poorly written and/or poorly formatted I generally don't bother. And I want the blurb to be descriptive of the book, not an excerpt or all about the author.
And the term Young adult has taken on bad connotations for me. It is often applied willy nilly to books aimed at 12 year olds and to books you probably wouldn't want in the same house as your 12 year old. I enjoy juvenile fiction occasionally, but have had bad luck with books labeled Young Adult.