Well this is funny: I just got back from seeing it after all!
DH announced tonight he really wanted to see it after reading abotu it, so off we went.
I must have misunderstood the no human voices part. Clearly they must have said something like none of the
lead characters had human voices.
It was very cute, had some good laughs in it too. Not a classic like some of the other Pixar films, but it was quite admirable when you paid attention to the infinitesimal details in there. I missed seeing the pizza planet truck. Will need to see it again.