I do, but I do like Rainbow Dash a little more, not sure why.
I like Rarity a little more then the others because I find her more interesting. I like all of the main 6, but those are 2 standouts.
If I had to say the one I like the least, it would be Fluttershy (Sorry those who like her). I feel she is very predictable in a lot of situations.
Obviously there are times where she is not, but this is how I feel about her.