The best thing to say about B&Q is that everything you need for home and garden is virtually under one roof.
The worst thing is that I don't like the set-up of their warehouses. Not B&Q's fault I know but they bought up 5or 6 northern superstores which were more female friendly and were 100% better and sorely missed. They sold all the male bit, tools, nuts and bolts-boring stuff, but were also brilliant at furniture, fabrics room sets etc and this is what B&Q lacks. If they could only incorporate that which they have sadly bulldozed we would have the best of both worlds.
What they are good at is kitchen planning. Someone will arrive at your home and set about planning your kitchen spending about 3 hours working it all out and present you with a graphic print out at the end of it. You are under no obligation to buy and it costs nothing. That's service and I wish they would provide a garden planning service. We bought a bog standard white melamine kitchen on offer in MFI, Wickes and another fancy place that cost the earth and B&Q were ridiculously cheap! It looks good too.
You can also get someone to advise you with colours for it too.
Their garden centres are pretty good as well.
I got some brilliant geraniums last year half price and they were excellent.
Service is usually good, helpful and friendly and they are pretty good at putting things right when they go wrong.