Try sampling track 15 - the opening number of "Herz und mund". The speed is fast, too fast for the singers and band to control; they are hanging on for dear life, and the soprano in particular is flat, insofar as one can tell what pitch anyone is at. What we hear is the sound of panic. You may find it exciting; I dislike it. It sounds to me like a sort of parody of the Gardiner way of doing Bach, and it proves that if you want to do it that way, hard-driven, emphatic, and at extreme speeds, then you had better make sure you have Gardiner to conduct it, or someone as musical and autocratic as he. Here, no-one seems to be in charge. Track 15 is the worst on the disc, true; but although elsewhere the performances are more competent, the soprano goes on singing flat, there is little light or shade, and above all there is none of that sense of the dance which Gardiner himself is so good at finding in Bach's religious music.
Peter Harvey should have known better. He was involved in the Purcell Quartet single-voice recordings of Bach cantatas on Chandos ten years ago, which had a much more experienced line-up even than that assembled here, but the result was equally disastrous. Bach is just too difficult for a bunch of chums, however expert, to get together and knock off a programme of his cantatas; you need a gifted and determined director, whether single-voice or "traditional" forces are involved.
Don't fall for the spirituality-market packaging on offer here. If you like the Gardiner way, get a Gardiner recording. There's no shortage. If you want one disc to sample the one-to-a-part style, try Joshua Rifkin's 2001 disc of Weimar cantatas on Dorian, which is both better informed, and much more musical.