Let me try to answer my own question as I see it--I think that when we first play a course, we usually react to the setting, the aesthetics, the beauty or lack there of in the surrounds. But I think as we play the course over a period of time, we come to see the architecture better, see the flaws, the defects, or the subtleties in the playability of the course. We see holes that no longer impress us as good holes--or some that we come to understand and appreciate over time.
If true, first reactions are a poor gauge of a course. What does this say about raters who rate a course after one playing?