No worries; I can see where you're coming from. I have to admit, there are times where I can find Rose a tad annoying, but in general I like her... Or rather, I like her interaction with the doctor (both Eccleston and Tennant), but even more so, I LOVE how she is mentioned in the conversations between the Doctor and Donna, because Donna reacts EXACTLY as she ought to. It's hard to explain, so I hope you'll see it yourself in due time...
Martha on the other hand... I don't know if she ever had a chance. I never found much personality in her, other than pining for the doctor, so I don't know if they could have done much more her. Had they fleshed her out and maybe given her more personality... And not made her fall for the Doctor 'cause that just keeps bugging me over and over again.
And gaaaaaaaaaaah Donna... Donna is perfect.
Speaking of Catherine Tate, have you seen "Much Ado About Nothing" where's she starring with Tennant... It is PRECIOUS!