Never have liked M&S, going right back to the 1960s. At work I saw all the trade press, full of articles saying how M&S had this wonderful new computer based stock control system, so that everything was always in stock, then I would go to the company's main branch in Oxford Street and they never had what I was looking for, because my size was very popular/ not much demand, ditto on colour or skirt length.
Anyway I have always considered their clothes to be designed for people 20 years older than I am, except that I am nearly 80, and my opinion hasn't changed.
Now and again, about once every 10 years, they do have a number of items I like, but I buy clothes more frequently than once every 10 years