Jack Campin -
"What is wrong with the guy that he can't write an appreciative review without starting it with a sideswipe at Mudcat?"

I'd imagine that he is rightly and fairly fed up with Mudcat, Jack, for the huge number of occasions that his name is slagged off and dragged through the mud of Mudcat, often very unfairly. People seem to object to his taking a broad view of folk, traditional and roots music but the quality of design and writing is far superior to anything else in this field and he is enormously encouraging to emerging young talent.
Think of the all the outstanding talents in the folk and traditional scene in the UK and then check here to see if they have been covered in fRoots. The chances are that they will have been.
All you mention from that article was "a sideswipe at Mudcat"; what about the fact that he had stumbled on a different way of presenting traditional music and was enthused by it and wanted to share it with people.
What struck me when I read that editorial in the magazine was when he wrote "There was a remarkable age range, from 20-somethings to 70-somethings, and they seemed to enjoy dancing – or sitting – with each other." and I thought, "I wish I had been there!"