No it's funny. She wrote several books previously about the Midnight Mayor who's very powerful so needed to have hugely powerful adversaries so it all got a bit samey (I picked this up from the reviews). Then she invented this self-help group of losers who have to save London. It's not as weird as China Meiville. Sort of like Discworld characters transferred to London and made more gormless.
Or Misfits would be a good analogy. The heroine talks like Vicky Pollard although she has infinitely more core intelligence. She whines a lot about discovering she's a powerful shaman when nobody asked her if she wanted to be.