I'm a fan (and you should be too) because... their voices and personalities.
'80's. I listened to Menudo and New Kids On The Block as any teenagers those days. But never really a fan - just the craze of it.
In 1995, I was already in my early 20's when I first listened to them - and I remember thinking, 'Those guys didn't look even cute- bad wardrobe, bad hair' - but I liked them anyway. I kept playing their songs over and over again. You can really tell that they are very talented. Their voices and music was just so amazing, especially when they performed live and accapella. Just wonderful.
My love for them grew even more after seeing the "All Access" and "Around The World" , they have great work attitude, work very hard. They each have different personalities yet so complementary . I always love watching them interact with each other and how they treat their fans. They are humble, real, genuinely nice and they are really best friends - just like family. I can imagine them just there sitting in my living room making fun of each other, just like they were my brothers or my sons
(I already have 2 sons - twins- so imagine 
Didn't hurt that they are goofy too - they're so close that they know each other very well and can make fun of each other without being really offended. They can make fun of themselves too. I love how they support each other.
Their musics and voices send the right frequency to my ears - the best way to listen to them is by closing my eyes and really appreciate it. Whenever I'm sad, their songs cheer me up. Whenever I'm angry, their songs will sooth me. Their songs make me love my husband more.
I love that they matured yet still so current that they are perfect for either any teenagers or an old fan like me. And they look better than ever.
There were other boybandss/artists that I like too but none of them could really touch my heart the way they do. Some of them I still like, some of them I forgotten already.
And nowadays, even though I had never put their pictures on the wall or neither had their memoribilia except a collections of their cds and dvds, I'm still a devoted fan that can't live a day without listening to their songs.
Best wishes to AJ, Brian, Howie, and Nick - and Kevin too - Backstreet Boys will last forever!

