If I could give it a zero I would.
Let's start with the awful signage. You are sent around in circles to find toilets, lifts or escalators. Everything is a chore to get to with poor signs and a lack of good planning. One lift which takes forever to get to you due to the amount of people means you are waiting 10/15 minutes to even get on.
Toy Kingdom - what is this monstrosity? Terrible layout, cramped area with average toys and just not interactive enough for kids. The toys aren't overly special and the majority you can buy elsewhere for half the price. Utterly awful experience.
I would never go back to Harrods, it is not what it used to be, it is an awfully laid out store.