Oh my God. I had avoided reading anything I could avoid reading about the new season because I was determined to give the new Who and the new crew a fair airing and I've found that a lot of things that sound ridiculous when reduced to a sound byte play out just fine in practice, so I had no idea who the new companion was going to be.

And so when I saw the little girl packing up her little suitcase because she wanted to run away with the funny time traveler in the box, I paused the playback (really good eyesight) and did a quick Google to see if they were actually going to have a child companion or if I was going to have my heart broken in the first act. I wasn't sure I'd be able to keep watching if they were going to break my heart. So I did the Google search and saw references to Amelia "Amy" Pond as the companion and thought "Oh, thank God." and resumed.

And had my heart broken anyway.

I have to agree with River Song: it's much better without spoilers. I don't usually have the willpower to avoid them.

That doesn't really answer your question. Generally I'm in favor of her. I really like the fact that she was created with an arc in mind. The Doctor's companions deserve more than "travel with the Doctor until the actor's career takes off/something tragic happens".