I definitely prefer Rose in Series 1 than 2. In fact I S1, she's one of my favourite companions ever, but by series 2 I found her annoying.
Really, Rose was meant to be the love interest, Martha was meant to be basically the love-struck puppy as Starkers puts it, and Donna is just the Doctors buddy. Which I like. But I think it went to far into just buddy territory with Amy and Rory. With Clara, she's a bit more like a younger relative, something which I fell will increase in series 8.