Adele is not overrated, 25 is overrated. Beyonce on the otherhand; her persona, her abilities, her music, her entire brand exemplifies overrating, a puffing of smoke.
Beyoncé. I love her, but her fans can be so over-the-top about everything with her. They literally worship her. She can do no wrong. If it weren't for her fans, I don't think she'd be overrated, because she's insanely talented, and she's got great music and an awesome work ethic. But she also has some of the most obnoxious fans EVER.