I mostly agree with your worst of songs, actually. Although I love Your Body. Whistle's lyrics are awful but I don't mind the song itself, it's catchy & light (great for summer). I also agree about WHYB, it got so old after 5-6 months once TTT came out.
10. Justin Bieber - "Boyfriend"
This song isn't necessarily bad; it's just painfully annoying. One day, a student was singing it in class, and then, for the rest of the school day I could not get it out of my head and it just made my life that much worse. Justin could've released a ton of different tracks off of Believe to be a lead single, but instead he chose this lame JT-rip off.
9. Chris Brown - "Turn Up the Music"
When this was first released, I was kinda like, "Oh, this song isn't that bad!" Until I realized that I got tired of it after about five listens. Seriously, "Turn Up the Music" is such a boring dance song, considering Chris is capable of great jams like "Don't Wake Me Up" and "Beautiful People."
8. Ke$ha - "All That Matters (The Beautiful Life)"
Even though I do stan for Queen Ke$ha, this song is so disappointing. Seeing that it was the only Martin/Shellback-produced song on the album, I was so excited...that is, until I heard it. What kinda mess?! She literally says "the beautiful life" at least 36 times, and the song is just so repetitive and boring. At least there's a good message behind all that generic filler noise.
7. Madonna ft. M.I.A. & Nicki Minaj - "Give Me All Your Luvin'"
The epicly bad comeback single from Madonna that has taken the world by force by means of payola is extremely disappointing! The friggin' features are obviously only there to sell the song, considering they appear for about ten seconds each, and Madonna herself doesn't even know how to spell the word "love." A mess.
6. One Direction - "Live While We're Young"
Taking a note from the good sis, Kelly Clarkson (Queen of Rehashes), One Direction try to imitate their success of "What Makes You Beautiful" with a song that is half as good. "Live While We're Young" doesn't come off nearly as infectious as their breakthrough single and overall just sounds less melodic.