Debenhams: crap fabric, gaudy crap fabric.
Why bother getting designers to do stuff then make it in CRAP FABRIC that looks really cheap?
I saw a nice skirt in their Preen range once but the material was so crap that the static it generated had magnetised every piece of fluff in the shop.
Generally, crap plastic shoes and bags although I have found the odd online gem from the designer ranges, made of actual suede and leather.
It's as if they have said, "let's just do cheap and nasty stuff for people who don't care about quality".
Also, their beauty hall is my absolute last resort. Rude assistants who ignore you when a simple, "I'll be with you in a minute" would go a long way. Often they don't know what they are selling, either.
Underwear: hopeless. I tried to buy Spanx there last year for under a dress that was very fitted. It was the beginning of December, I.e. prime Spanx shopping season, and that section was a rag bag. It was like TK Maxx: one of every style in random sizes, haphazardly arranged and jumbled up with other stuff. I found a variant on what I wanted in BHS of all places!
The only good bit of Debo's is the homeware.