Unless Apple are going to spend the resources making sure that the raw conversion is as good as, say Capture One, then I disagree with you. I regularly blow my images up to 16x24 and beyond, and the raw conversion in Aperture is nothing like as good as Capture One. For the reasons mentioned on this thread, that pretty much means that Aperture is no good to me.
There are other reasons, related to raw image processing I don't like it. For example, the lack of a curves function. Doing any kind of curves manipulation during the raw conversion process is always going to be better than doing so in Photoshop and the fact that it's missing seems like a big limitation to me.