Ha, to be honest, when I heard of MLP: FiM I passed it off as a little kid show, called it all kinds of name. I told myself and my friends that show was "nothing" compared to other show's, only to find out how wrong I was...
My little cousins came over and they brought the Blu-ray disc of the 1st season over my house and they wanted to watch, of course them being the guest of honor I didn't turn them down. So, they started from episode one, I watched it with them, about half way into episode one I started to think to myself, "This is kind of interesting, oh, no what am I thinking all of a sudden.." Episode one ended, and soon episode two started to play the suspense of episode two and the ending, It was so good...
Then I started to watch the full season of episode one, I just fell in love with the series... I don't know how, but I did. Soon, I watched every MLP: FIM episode there was, started to read fan fics, and pretty much everything else related to MLP: FIM. I soon told my friends, the ones that I told that the show was horrible, most of them watched it and agreed saying the show is awesome. I guess if you have an open mind to a lot of things you can change your opinion pretty fast, depending on how good or bad it is to you.
I'm saying, don't knock things before you try them, I learned that through Friendship is Magic! xD