I can't recall anyone needing a new drive motor , so that's rare in itself. A new one , by all accounts should be good and reliable and you are indeed unlucky to have suffered that. But , 3 weeks for diagnosis is absolutely ridiculous , either the MG technicians know their product or don't and have to keep referring the matter " upstairs " or have no say in the financial outcome of their investigations again passing the problem to higher authorities who then can decide on the most suitable ( cheaper ) solution. I bet a majority of that 3 weeks was toing and froing of 24 hr( or more ) delayed responses from MG UK to SAIC and back , whilst yourself the car and the mechanics sat there waiting. Unfortunately not an isolated incident and of course the major reason why many will not choose MG again . Doubly unfortunate that many other manufacturers are following suit in a race to the bottom if other forums are to be believed.