I've tested Raw files from the Canon 10D, Rebel XT (350D), and 5D. I haven't done a side by side comparison of Raw processing between Aperture and Camera Raw, as did the reviewer for the ars technica article. But I have to say that I generally like the way my Raw files look in Aperture.
As I've mentioned earlier, I do want to be able to use Camera Raw in addition to Aperture's own editing tools. Sure, many of my Raw images can stay solely within the Aperture environment, and that's fine. But when I really want to "work a photo," I want Camera Raw. Plus I want to be able to work in layers afterward, use specialized filters, etc. Then, when I'm finished, I can send the 16-bit file back to Aperture for management.
I'm not willing to speculate on what should be included in future versions of Aperture yet because I'm still learning the program. Sure, things like Camera Raw connectivity, music for slideshows, etc. seem obvious at first. But for now I'm content on learning as much as I can and reporting back my findings here.