We R Who We R - Kesha
Party Rock Anthem - LMFAO
The Lazy Song - Bruno Mars
Changed The Way You Kissed Me - Example
Don't Wanna Go Home - Jason Derulo
Louder - DJ Fresh
She Makes Me Wanna - JLS
Swagger Jagger - Cher Lloyd
Promises - Nero
Don't Go - Wretch 32
Stay Awake - Example
All About Tonight - Pixie
What Makes You Beautiful - One Direction

Basically 95% of them.

Promises by Nero is the lowest-selling #1. So on that basis you could argue it's the least deserving of being #1. But I think it's a brilliant song.

All of them except Rihanna, Adele, Olly Murs and Nicole Scherzinger.

At the end of the day, there is no single that "should have not" been number one.Each song was purchased to get to No.1, so if some people were willing to give their money to own this particular song then it deserved to be No.1.Now, whether the target audience of those songs should or should not be the only audience the labels care about, that's another story...

This.

We R Who We R deserved it's #1.

Agree with these and I also agree about Adele. I am so sick of hearing Someone Like You now.

All except Adele and Bruno Mars.

Cher Lloyd - Swagger Jagger (Should not be in the top 40)
Rihanna - What's My Name
Jason Derulo - Don't Wanna Go Home
The Wanted - Glad You Came
Pixie Lott - All About Tonight

When I first saw the title of this thread I instantly thought of Cher Lloyd.

Looking at the list, I'd say all of them except for "What's My Name", "Don't Hold Your Breathe" "On The Floor", "Party Rock Anthem", and "Give Me Everything".

I don't know how Example got two number ones, he just mumbles over dance music. Stay Awake isn't even catchy or memorable.

General Music is in decline along with the economy

Pixie Lott 'All About Tonight'

Adele, Kesha, Rihanna and Pixie Lott should have been #1 but none of the others Example in particular

JLS - She Makes Me Wanna

Cher Lloyd - Swagger Jagger

Jason Derulo - Don't wanna go home

Adele - Someone Like You

Anything by Example

ALL Big No's for me