I'm not interested in any British/American rivalry thing here, but if you want an excellent example of someone waltzing in and doing someone's job FAR better than they are doing it themselves, have a look at Russell Brand on an American chat show called Morning Joe.
There are no less than three interviewers and not a one of them seems able to actually ask any intelligent questions - they keep talking amongst themselves and just don't seem capable of doing the job they're presumably being paid quite a lot to do. Russell does a brilliant job of rubbing that in their faces while being polite and intelligent and funny, while the three interviewers are incredibly rude, but they don't even seem to be doing it on purpose. They just come over as incompetent and rather stupid. It's well worth a watch.