I'm certainly not an expert in either relgious architecture or the museum sort, but aside from the statements that have been made about functionality and how impractical some of these religious structures are. Some of the world's most recognized churches/cathedrals have taken hundreds of years to construct. The Gaudi cathedral in Barcelona "Sagrada Family" began constructing in 1882, and is not scheduled to be finished until at least 2050, for anyone who has visited Barcelona would have noticed this. Another example would be the Cologne Cathedral in Germany, which took approximately 800 years to complete. It's hard to compare any structure to some of these historical churches and cathedrals given the time that has been put in to make them look that way. That being said, like any art, it's somewhat subjective and what one may find beautiful, the other may consider dated, or messy.