We all know that there are advocates and enemies of using KProbe for determining write quality. Unfortunately, most of the folks on both sides have very little understanding of what is being measured and displayed, and how it is done.
Putting those questions aside, there's a very large hole in the logic that CATS-type calibrated machines have something useful to offer the average end-user in determining read-ability of a disc. Unless the end user is using a CATS machine to read all their burned discs, and also using one to play their movies, it offers nothing beyond a very general indication of media quality.
What seems to be missing form all these arguments is the understanding of the real purpose of PI/PO scanning. This purpose is NOT to determing how a disc measures up against some theoretical (and nonexistant) standard of quality. The one and only purpose is for the end user to be able to find the media and burn speed that works best in his own hardware. To this end, KProbe has been well-proven to be more than adequate to the task. When used correctly, (and interpreted correctly), the results are consistant and reliable, and also predict compatability and read-ability.
To sum up, we don't need a more "scientific" way of analyzing anything, as such a thing is impossible. You can't predict the behaviour of someone else's hardware, you can't predict the considerable variations in media, and you can't control how any of this information is understood or used by others.
What we need is more understanding of what is being measured, how and why, and more appropriate use of the tools and results.