Yeah there's a lot of crappy sites out there ... but at the same time such a law would force down the best and the brightest. The world of web-design would stagnate and innovation would become impossible. In essence you would be subordinating everyone, including the best, to the level of mediocrity.
With the good comes the bad. The good news is that those crappy sites hurt themselves in the long run while the best get the business.
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