For me it has to be:

will.i.am - Feelin Myself
Eminem - Headlights
Nicki Minaj - Lookin Ass N***a

I'll update later.

will.i.am - Feelin myself
Pharrell - Happy (I know it's strictly not a 2014 song but it's dominated most of 2014 so I'm gonna count it)
A Great Big World & Xtina - Say Something
David Guetta - Shot Me Down (awful awful awful)

yeah i am so disappointed with Nicki Minaj's new song

Sam Bailey - Compass (boring)
David Guetta - Shot Me Down
will.i.am - Feeling Myself

I personally do not like The new Christina Aguilera featured track thats been playing a lot lately. Depressing!

The new Foster The People single is really poor.

Say something is good. Very emotional song but cant stand that dork who sings it with a really whiny voice

Worst-
Feelin myself
Happy

I've only heard two of the songs mentioned on this thread so far, so I'm feeling lucky

Pharrel Wailliams - hate hate hate this song

Zedd - Stay the Night is absolutely awful.

Any song by One Direction
Any song by Justin Bieber
That new Busta Rhymes song

Yep, can't believe Hayley Williams was involved in this sh*tty generic club track.

Good lists so far.

Shot at the night- david guetta ft skylar

Sam Smith - Money On My Mind
Pharrell - Happy
Clean Bandit - Rather Be
Will.I.Am - Feelin' Myself

Whatever crap Bastille, Disclosure, Avicii, John Newman or Rudimental have released this year

Shakira ft. Rihanna - Can't Remember to Forget You
Neon Jungle - Braveheart
Gorgon City & MNEK - Ready For Your Love

Sam Smith - Money on my mind

DJ Fresh - Dibby Dibby Sound

Busta Rhymes - Thank You

Will.i.am - Feelin' Myself

Jason Derulo - Trumpets

I've grown to really like Coming of Age, the video is good

I was disappointed by Can't Remember to Forget You, I think I was expecting a Beautiful Liar part 2

Dibby Dibby sound and Feelin' Myself are unbelievably shit and possibly two of the worst songs ever written. Trumpets is pretty bad too.

Not in the same league are Happy by Pharell, not really a bad song per se but overplayed. Not too keen on Christina Aguilera's song either.

I'm sure I'd hate the rest of the songs in this thread as well but I've not heard them (as far as I know)

Trumpets makes me want to puke, why do things remind him of katy perry and kanye west songs? Very weird song.

Lily Allen - Air Balloon and L8 Cmmr

Love her first two albums, but her new stuff is rubbish.

Will.I.Am- Feelin' myself

II havent heard any of the songs listed here so I think I'm doing pretty good this year so far.

Sam Smith - Money On My Mind. So dreadful and jarring to the ears. I'm happy he is doing well though as he has an phenomenal voice see his song Lay Me Down and his collaboration with Naughty Boy on La La La (one of my favourite tracks of last year).

DJ Fresh - Dibby Dibby Sound

Little Mix - Word Up! (Trying to ruin a classic for me).

David Guetta - Shot Me Down