I guess it depends upon what one takes things like beauty and goodness and love to mean, and what reason one has for valuing them. If, for example, beauty is valued as a representation of divine order and creativity on the part of a supernatural God, then considering that it might not be such may undermine one’s appreciation for it. If, however, beauty is understood as a natural phenomenon, related to symmetry of form, fluidity of lines, vibrancy of colours or whatever else one subjectively appreciates as beautiful, then the interaction between the observer and the observed still produces a sense of beauty - even if the beauty is transitory and not representative of anything other than natural phenomena. For me, I suspect it would be the opposite of your response. If anything, discovering that the vast and wondrous cosmos was divinely designed and intended would be akin to discovering that a magnificent rock formation was carved by a human sculptor - rather a disappointment.