Selena Gomez - Lover In Me/I Like It That Way/Sad Sad Serenade. 3 of her worst tracks

Björk - too many to count

Neon Indian - Deadbeat Summer (I hate listening to it unless I'm in the mood and its the most popular song).
Rihanna - Anything before GGGB & Unapologetic (tho to be fair I didn't actually get into her until GGGB)
Meghan Trainor - Like I'm Gonna Lose You (I don't even know the lyrics because it feels like a chore to get through without watching the MV

)
Lana Del Rey - God Knows I Tried (it just drags on)
That's all I can think of my faves atm. There's more, but I can't think of stuff that is actually overrated, not that I just dislike.