Not the worst or your least favorite song, but the song that gets alot of undeserved (in your opinion) praise.
I'll start:
Adele - Turning Tables (nothing special)
Beyonce - Crazy in Love (so mediocre and monotonous, not even the best single from DIL)
Rihanna - Only Girl (the chorus is way too shouty and irritating)
Taylor Swift - I Knew You Were Trouble (very basic, and the bridge is horrible)
Rih - Probably S&M or Man Down
Bey - Superpower or Ring The Alarm (i do like RTA, y'all just do it a biT much.)
Nicki - FDA and some of her features.
Katy - Roar.
Gaga - probably Born This Way and album tracks from BTW.
Ariana - Some of the album tracks from YT.
Iggy: Change Your Life