The better looking the code, the less effort people will put into reviewing it due to the ease of reading it - the assumption being that what is beautiful is good. Just as a beautiful facade of a building can hide a cheap structure behind it, the same is true with code. Beauty itself is not a good signal for goodness as in excess it is in effect a rhetoric device that aims to mislead and draw ones eyes towards itself and away from what lies beneath it.

A beautiful building is only as good as the correctness of its foundation, framework, materials, and construction. Those qualities can only be assessed by those with expertise enough to understand their importance. Beauty in its proper place is the output of the intersection between a craftsman and a engineer. Beauty is optional, but it makes life more worth living. The same is true for code - attractive code is optional, but it makes being a SWE more rewarding.