The only bad songs on OOTB are Self Inflicted, One of the Boys and maybe I'm still breathing. The others are masterpieces, I actually LOVE Mannequin 
Teenage Dream is complete perfection. Like let's not pretend it's pop perfection, IT IS the definition of the pop perfection. I can't find not even ONE bad song on the album plus the TDTCC. 
PRISM on the other hand has like 3-4 bad songs, Love Me, This Moment, International Smile and TIHWD for me. 
Still don't know if OOTB is better than PRISM or the other way.