By Tom Gott Right, where do we start? Chelsea, or whatever this blue-coated sham is pretending to be, were beaten from pillar to post as they shipped five unanswered goals against one of their biggest rivals. A stunning performance for every bad reason imaginable. Here are Chelsea’s best and worst players according to 90min’s player ratings. Chelsea’s best player vs ArsenalDjordje Petrovic – 5/10Djordje Petrovic made an error which led to a goal inside five minutes and somehow still emerged as the only Chelsea player with any shred of dignity intact. The stopper dusted himself off and made fou…