Rare's developmental quality (until Viva Piñata that is) but both games could have been much better. So, what does Rare think of the majority opinion on those launch releases? Well, they're a business, they care about sales, and according to Rare's Nick Burton, they sold a metric ton of copies of each (you jerk):
"One of the things that I always find funny is when people always quote Kameo and Perfect Dark Zero as being flops at the launch of the 360. In the industry if you break even you're lucky, you're in the minority," Burton told VideoGamer. "If you make a decent amount of money you're really in the minority. You're in the top percentile. Those two games made a lot of money. For the install base they sold phenomenally well."
Honestly, we didn't need Burton to tell us PDZ and Kameo made money because we can already tell Rare has been infused with cash. Look at Viva Piñata and Banjo Kazooie: Nuts and Bolts -- clearly the people of Rare purchased some creativity and talent with that stack of monies. We joke because we love.