Agree with all the posters. Next should just read this thread and save money on paying people for stupid new ideas.
So much of their stuff is out of stock, delivery fees are too high & delivery is unreliable. I think you also have to have an account to order online which is a silly policy.
As others have said, too much shapeless synthetic tat. What I would like to see from Next & M&S (who are also constantly employing new people to rescue their clothing side) is good quality basic stuff that is fashionable but in a classic way - e.g. some basic soft wool jumpers in a good range of plain colours, not £15 acrylic jumpers in dayglo green that will last 3 months if you can bear to wear them that long. And good quality, well fitting t shirts, underwear, trousers, etc. It's so hard to get things like this - shops seem to focus on clothes being quirky, bright, 'ditsy', etc rather than wearable.
The kids' clothes are ok quality but need more plain stuff rather than all the sequins, prints, bright colours, diggers and comedy/cute slogans. And why the huge age ranges for many of the kids' clothes? There's no way most 16 year olds would want to wear something that is also available in age 4. Here's a classic example: www.next.co.uk/xo71034s12#180245 - my 16 year old would die of shame wearing a top with 'cute but crazy' written across the chest and knowing she might bump into a 3 year old wearing exactly the same thing.
The other thing that used to put me off their kids' tops was that so many of them came in packs of 3 or 5 when I only wanted 1. They should do the mix and match 3 for 2 offers that H&M do.
The sales are a mess - they clearly keep clothes for years and bring out all the old tat twice a year and turn the shops into jumble sales.
On the other hand, they do tall and petite - hopefully those won't be axed as part of their restructuring. I don't mind them having Costa branches, and the staff are generally very friendly.