"When she has heavyweight assistance, it's in order to make the sadness sadder, the funny bits funnier, and the hopeful bits sparklier. Max Martin helps to deliver the hit, We Are Never Ever Getting Back Together, but he's also on hand for the vaguely dubsteppy I Knew You Were Trouble (a polar opposite to Amy Winehouse's You Know I'm No Good), and 22, the Ke$ha-style drinking song every female singer's album seems to need at present, but still one written with one guy in mind".