This is probably a very unpopular opinion for me to have.....but I don't like Mercy.
I think it's way too repetitive, and it sounds like a U2 is covering a Coldplay song. The melody line is the same for way too long, and the lyrics are (in my opinion) cheesy and don't have that typical Bono-ness to them. The best part is the chorus, but even that doesn't really go anywhere we haven't heard them go before. There's nothing that really jumps out about this song. I'm really hoping that it gets a lot of work and undergoes some major changes before getting put on the new release.