325$ Million in the first week for a new IP is insanely good. The majority of sales occur within the first two months of a game's launch, so I wouldn't declare it a disaster yet.
$325 million is a ton of money but given what's been put up by Activision, the question is if it's enough to satisfy them.
I always wondered what might happen to Bungie if their new IP underperformed after it was announced that Activision was going to publish... sounded like a deal with the devil. Of course Activision was a different company back then, Kotick seems to have mellowed out a bit.