Resistance. has been selling strongly even before the bundle
No doubt, it was the number #1 selling ps3 title for quite a while, a claim R&C cannot make. Resistance is a quality title no doubt but a lot of its legs are due to bundling and the initial dearth of titles on the PS3. Low initial ps3 sales (and a tiny install base) contributed to Resistance's initial low numbers.
I'm not trying to suggest that R&C won't have any legs, or won't move any more units, but launch titles performance is really hard to compare with other titles. It probably would have taken near a 50% attach rate for resistance to chart in december 06. R&C could have made top ten last month with ~6%. I could see this if there had been a number of sought after titles in competition, but it seems roughly 75% of ps3 owners chose to buy no game at all in October.