I agree. (But then again, I'm a guy so I don't really care if the Doctor is "eye-candy" or not.)
I think bringing in the older Capaldi will help improve some aspects. I saw a cool post the other day talking about people complaining that Capaldi is to old to play the Doctor. Don't they realize the Doctor himself is over thousand years old now??? (not exact words). :lol

Anyway, yeah it was sad what happened to Donna. 
Martha's alright. She had to try to win the Doctor's affections and the audience's approval both of which was difficult after Rose.
In her own right, I think Martha had a good ending - taking off on her own. Moving on from her crush and actually living.