Lewis Hamilton’s switch to Ferrari has been brutally slammed as a ‘doomed vanity project’ by a top senior in F1. The curtain is closing on Hamilton’s decade-long stint with Mercedes and it’s proving to be an unhappy ending for the 39-year-old. Mercedes appeared to have turned a corner in the summer with Hamilton ending his near three-year wait for his 104th F1 victory. That came in emphatic fashion at the British Grand Prix before adding his second of the season at Spa. But Hamilton has failed to get on the podium in any of the last seven races and suffered his worst finish of the year at the …