DOES it really matter what critics say about the Prius? The old one was a dreary drive, but its rate of adoption put Mia Farrow’s efforts to shame, as people of all walks worldwide tuned in to the hybrid’s obvious green message. So after a million-plus sales, Toyota’s follow-up has to possess more of the same eco cachet, but with much-improved steering, ride and handling characteristics if it is going to win over the harsher critics as well. Has Toyota succeeded? Is the Prius at last the sort of car you could buy with your driver’s heart as well as your environmental head?