Uh... wow. I have to admit that was pretty disappointing. I thought Donna was going to wind up being a chemeleon arc'd Time Lady or something that wasn't... completely random. Too much to hope for, I know.
I can't really form a good rating right now because I was left with more of a ";____;" and "... wut." feeling than anything else.
Oh well... goodbye one of the best companions ever.
... and goodbye RTD.
(I'd like to think all the characters were dancing around because of that.)