1. It's a decently written show with great characters and nice animation, style, and aesthetic. Plus, the creators pretty much took a franchise that was pretty much aimed squarely at little girls and made it something that anyone can enjoy.
2.I first learned of the newest generation of MLP when I saw toys being given away via Happy Meals at McDonald's. At the time, I just rolled my eyes and went about my day as normal. But then, I noticed a bunch of people on here with Pony avatars. I was somewhat confused at first, but rolled with it. Then I started hearing about how good the show was, so I decided to watch the two part pilot.
At the time I thought, "This is okay. A lot better than something called "My Little Pony" has the right to be." Later, I decided to watch the next episode, then the next episode, and the next episode, and the next episode, and the next episode...
At some point, I ended up watching the entire first season over a span of a few days. And I loved nearly every minute of it.
3. Well there was this one Youtube video I saw which made fun of bronies. At the time, I simply thought that it wasn't all that serious and mentioned that I was a brony, assuming there were others like me. Let's just say, I wasn't exactly welcomed with open arms. :/