Going against the grain here, but I got the M&S advent calendar today and I think it's great value. It's full of products that I do actually use unlike the previous summer boxes and last year's advent calendar. Yes, the bag isn't the greatest quality, but it will be ok for storage at home. DH also suggested I could use it as a packing cube when we go away next year which is a good idea. I suspect more than a few bags will make their way to charity shops, and if charities can benefit from them then surely that's to the good.
Compared to the price of some of the more 'high end' calendars which come in boxes which subsequently are disposed of, I think the M&S one this year is a good one.