Frustration - that's the main feeling that book got from me. 
 "Rocked Under" was like broking record playing the same scenario again and again. Scott would make a pass for Emma, they would make out, Emma would suddenly change her mind and reject Scott, they would exchange angry and hurtful words. And the next day it all will be repeated. And so in went on and on and on. 
 Now about Emma. She was a spoiled brat. Her behavior was despicable. She hurt Scott so many times. Sometimes she was real bitch. Leading the guys on, provoking fights in bars, trying to make Scott jealous then complaining about him being possessive. She kept changing her mind back in forth faster than a baby changes diapers. She hated Scott for being with other girls while she herself was dating other guys. I don't think that a girl like that deserved to a get a man in the end. She deserved to get slapped. 
 Scott was no better. He was more decent then Emma, but he handled the situation wrong. If you like a girl then be a man and have balls to tell her that! But he probably expected to read his mind and when she didn't he chose to be an asshole to her. 
 Well I think these two deserved each other. 
 I also didn't like that both heroes thought that solutions of the problems lays in alcohol and drugs. 
 All in all, I hated characters, despised their behavior, was bored with repetition of the plot and didn't like the message this book was caring.