I think it was okay. It was not really quick, or catchy like Buffy's (and Angel's) opening tune. but it's a completely different show and that asks, obviously, for a different kind opening music. I think it sort of resembles the serenity of the wiped minds of the dolls. And the bit at the end was great, with the xylophoney bit.
I do wonder where Joss left the other people in the images. Overall, it's of course nice to see Eliza, but they could have picked better, more exciting bits. But I guess that for the first episode you don't want to show too many images from later on in the show. With Buffy they also regularly changed the images of the intro mid season.