NPD numbers are unreliable due to the exclusion of non-retail delivery. (Comparing NPD data for The Orange Box to NPD data for World of Warcraft is apples and oranges. Even Bioshock's underwhelming numbers for last August were quoted without any reference to digital delivery, which could have been significant through Steam and other services; Bioshock was pre-loadable through Steam and was heavily promoted there.) And non-US territories can actually produce significant sales in many cases; Germany e.g. is famously loyal to its PC games. Part of the problem in this discussion is that the only people with accurate numbers, including all PC copies delivered digitally, are not able to share them.
That still wouldn't bring PC numbers up to console numbers, of course, but the entire discussion - throughout the internet - is currently based on nothing more than vague guesses.
Entropy, you may decry the use of "consolization", but it accurately captures what many people noticed about UT3's usability. Out of the box, it feels like a port from console, not the other way around; interface elements are oversized and sparse relative to many other PC games (and obviously relative to previous iterations of UT). Pointing out that UT3 is more accurately described as a PC title ported to console doesn't change the basic reality that it appears to have been designed primarily with console limitations in mind. Perhaps it was simply poor interface design rather than console-oriented design, but I think it's understandable that people keep mentioning "consolization". This is even more true because, between the "beta demo" and the retail release, there appeared to have been virtually no changes in the interface, which really made it seem that the retail interface was satisfactory to Epic rather than a subpar waypost still a few patches shy of "final". (And yes, I realize that the next patch fixes or mitigates many of the interface problems, and I'm looking forward to it.)
Part of the challenge is that consoles don't really have a native interface, so I think there are fewer inherited expectations of usability parameters in console games. In the past, some PC game designers have noted that PC games can also be viewed as hermetically distinct from the rest of the system - you boot into the game and boom, you're in an entirely distinct interface - but I've come to believe that this fundamentally misunderstands the way people use computers. Users typically expect some consistency in all other apps, and games are not wholly exempt from that; when you ship a game with an interface that foils basic expectations of mouse-driven control, you're bound to frustrate a lot of PC gamers.
