I just recently gotten into the show and I have found it to be funny. It's a lot like the Powerpuff Girls in which I was a fan of when it was around and knowing that MLP was created by that very same person that did PG makes this an awesome show.
I also like this show because it's not syrupy, saccharine, and all "let's hold hands and sing about rainbows." There is an amount of snarkiness and cynicism in the show that balances the sweetness of the show. It's kinda like a good raspberry vinaigrette desert. Also, I am not one for musicals, especially Disneyesque types but the musical numbers on this show are bearable and some are actually catchy as well as humorous and ties in to the theme of the show.
As for avatars and signatures, I'm keeping my sig as I have worked hard on it and I will probably change my avatar to my ponysona.