I worked for Comet as a Christmas temp and ended up staying there as my first full time job from about 2000-2006ish. 962 store, which ended up being 1091 (it's actually the store shown on the BBC article,
http://www.bbc.co.uk/news/business-20164228)
I have a fair number of friends who's jobs are at risk and it sucks to be them, however, this has been a long time coming and some of the people there when I started 12 years ago, had already worked there for a few years and had never progressed.
Ultimately, you can't say that all the staff are useless or rude, as there's 6000+ of them and everyone is different, but I can guess at what is most likely to be the undoing of them...
Firstly, terrible, awful people in management. I mean the WORST kind of human beings to be put in a position of power. In my time there I had probably 40-50 different managers of different levels and I can name literally two who were actually good managers and humane enough to stomach. Most of the management were from some higher-echelon circle jerk where you got in if you licked the right set of balls.
Those promoted into management were those with the best sales figures. The best sales figures in Comet, by a country mile were those sales people that lied, cheated and downright fisted the systems in place and the customers we served. They'd lie about simple facts, they would steal sales from other colleagues who had done the groundwork and more. These are the people who were made 'management'.
With that, you had a culture of 'performance management' through bullying, bending of employment laws and some quite basic human rights ('You can't leave the shop floor for the loo until you've sold another 5 year warranty') and then the gradual removal of any incentive for people to deliver any level of service. It was all about milking customers for attachements from the moment they walked in the door. Open questions and planting the seed.
They used to have generally competitive prices, but this was as a result of negotiating very poor service level agreements with vendors and suppliers, so when things went belly up, the customers had to usually take the longest, slowest and most aggrevating possible path to get a resolution. You'd frequently find customers screaming, swearing and shouting at staff who were helpless to assist with broken products whilst managers hid out back.
That's just the enivironment.
The downfall of the business, is this terrible, awful style of people management, the general culture of oppression and crushing the life out of people - combined with a massive understanding of what needed to be done in the market they were supplying.
Frequently they missed innovative products because the buying department were pushing prices too low, stock levels were poor, stores became half empty and shabby and the whole experience of going to a comet store became pointless unless you wanting an argument about something.
Don't even get me started on Monster Cable.