I don't get the judgment that seems to come from some people regarding what other people read.
MAJOR CONFESSION AHEAD...
I LOVED TWILIGHT. I loved it. I loved all four books. Then, after I read the books I enjoyed watching the movies too! AND I AM NOT EMBARRASSED. You know what I've never read? Fifty Shades of Grey. That was a HUGE seller. People have polarizing opinions on that book, either finding it tantalizing or repellent. I have no interest but I certainly don't judge those who do.
I like literature, I like some erotic romance, I tolerate graphic novels. I like non-fiction. I like to read in general! I love to get lost in a story. Sometimes it is a story that aligns somewhat with my current or past life experience and sometimes it is completely different. Ranganathan's second and third law make it clear that librarians are to help every reader find his or her book and every book find its reader. To me, that means no judging. It's so unnecessary to assert intellectual superiority over someone who enjoys material which you determine to be inferior.
As far as New Adult, it is HOT right now. A lot of the authors start out self-publishing and their fans are DEVOURING their stories. This is a young market that the library should absolutely serve. We should promote and stock materials they love. What is our excuse if we don't? A lot of college students might enjoy New Adult literature in their downtime when they are not reading their academic material. Let's allow those readers to enjoy their books and make sure they feel ok about it.
Does enjoying a bag of skittles now and again mean you can't enjoy a gourmet meal? No!