Not passing W3C validator check can hardly be called sloppy and unprofessional. Try running Microsoft, Apple, Facebook, Youtube, Twitter, Google, hell even supe

Not passing W3C validator check can hardly be called sloppy and unprofessional. Try running Microsoft, Apple, Facebook, Youtube, Twitter, Google, hell even super simple sites like Hacker news through W3C and see if they validate (hint: They don't). Agree with point 2 though, that one should be fixed.