Well, I have seperate opinions for each of them. I love Rainbow Dash of course, she's my idol.
For Rarity, yeh, I guess she's okay since she's Sweetie Belle's sister.
Twilight, I'm not so sure. Once, she called me over there for a story and then I fell asleep halfway through the story.
Fluttershy is really nice. Angel can get a little bratty though.
Applejack is alot like Rainbow Dash, so I like her the same with Rainbow Dash, well I like RD a bit better since she's a pegasus.
Pinkie Pie can be a little random. But I love her parties. They're almost as great as the gala.
Derpy, yeah, she's nice. She crashed into me while I was on my scooter once though. Might be the reason that I can't fly.