This question is harder to answer than i thought it would be. I first started to like them when I heard What Makes You Beautiful because it was so catchy and cute. Then I saw the One Thing video clip and realised how absolutely gorgeous they all are. Then, I watched One Thing: Behind the Scenes and that was the first time I ever heard their accents... and I was in love :D When I heard the acoustic version of One Thing on the radio, I knew that they could really sing and that they sounded like angels. Next came the video diaries and interviews when I discovered how hilarious and adorable they all are. So I think the reason I love 1D so much is because they are the ultimate boy band - they are amazing singers, they are kind to their fans, they are so funny in interviews, AND they are BEAUTIFUL!!! <3