I have a historic fondness for PPC chips for a couple of reasons. For one thing, they carried us through the dark days in the early Pentium years with style--they were hot stuff back then. I liked the vector processing unit back when that was more unique and provided a really big speed boost over the x86 architecture. I also believe that early on PPC was a far better design than at least Intel's x86 (the crusty "MHz over actual speed" P4, for example), but the Core architecture has totally changed that--it's quite nice.
Most of all, though, I liked PPC because there was at least the theoretical chance that IBM/Freescale/whoever would come up with something REALLY revolutionary (like the early G5s if they had actually scaled as well as expected), which would then be exclusive to the MacOS and *nixes that ran on it. Now, if there is a huge breakthrough, everybody else gets it too.
That said, as much as I love my G5 tower, Apple picked exactly the right time to switch. If they'd done it during the P4 years, it would have been a mistake, as the G5 really was superior early on. But the Core architecture has spectacular potential, and so we got on the boat at the best possible moment.
And my CD MBP is great, too.
(Of course, frankly, who cares what it runs if it runs fast and does its job.)