I like the pairing so its good news for me. Plus I think its nice to get some continuity. I don't really see why, as long as the actors are wanting to stay, that the Doctor can't keep the same companion for the whole of his run. They could add "extra" companions now and then for a few eps to make it interesting, but if Matt does, say, 3 series, why shouldnt Amy Pond be the companion for the whole time?
I wish that Catherine had done more than one season, but only with Tennant as the Doctor. I loved Donna as a character but I don't think she and Matt Smith's Doctor would have worked very well.
I was glad to see the back of Freema, I thought she was a poor companion personally - not Freema's fault really, but the whole "in love with the Doctor" thing was just too ridiculous for words, and the Martha character was WAY to moany groany.
As for Billie Piper, well. I quite liked Rose as a character but towards the end she got WAY too annoying. I wouldnt have minded seeing the back of her when Eccleston changed to Tennant.