They're the epitome of good idea, bad execution. Having mismatched and jumbled designs is a cool idea, if the resulting design is still cool. Having a design that's just an unappealing mess might be true to the idea, but it's still unappealing to look at. When the series is based around unique and appealing Pokemon designs, having ones that are designed to be unappealing just means they'll be overlooked forever.
The Ultra Beasts were weird, jumbled messes of designs sometimes, but they were still interesting and not an eyesore.