Yes, I miss Rose a great deal too... but only as she was in those first two seasons. Now that she has returned for the last 3 episodes of Series 4, she's changed a lot, and I'm not used to seeing Rose this way.
I thought Martha was okay, but she was to "openly smitten" with the Doctor.. I think it was captured best from her line in "The Family of Blood" where she says, "You've gone and fallen in love with a human... and it wasn't me."
Donna is better because I love her ultra-sarcastic flare.
I read that Billie Piper doesn't let her husband watch those Series of Doctor Who with her in them because she's afraid of any potential criticism... HOW THE HECK does she handle "Secret Diary of a Call Girl" then??? 
I'll admit, I lost some respect for her for doing SDoaCG. I wish it was someone else instead of BP.