Not Mo, but when I tried this (the procedure is described in the HTS Forum), I immediately noticed that the overall frequency response was considerably flatter, when measured from the MLP only. I attribute this to the fact that since the mic placements are so close, the frequency response variations due to room position are minimized, therefore Audyssey has fewer variations to compensate for.
HST, measurements taken over a wider area than the MLP showed a less even frequency response. So, whether you think the "tight" mic pattern sounds better or not depends on whether you are sitting in the MLP or not. For selfish people like Keith and myself (I mean that in a good way), optimizing response at the MLP could be a good thing. These are my conclusions based on my observations--YMMV.