Carrie Ann gets on my nerves too. I think she's there for eye candy, mostly. She rivals Len for the Nitpicky Award, LOL.
I like Len for goofy reasons -- for one, my dad's name was Len, and for another, he's cute when he smiles! LOL But I *love* Bruno. He's so passionate, and the goofiest stuff comes out of his mouth, and it's funny!
You can't really fault any of them (except perhaps Carrie Ann

) on their credentials to judge dancing, so it comes down to personality, really, imo.
And yes, I would love to vote Samantha off!