A difference in tastes here, but despite the helpful and detailed review of this programme from a previous reviewer, I can't endorse it as a great series. Possibly an important pioneer for the cheap and cheerful globetrotting police/spy shows shot in Pinewood that we all enjoyed in the 1960s, but in itself not quite there.
Michael Quinn was not really a success as Craig, although he was such an unusual character, he certainly stood out among the rest of the cast (Angela Browne made a strong impression in series 1). The trouble was Quinn was very tall, and a bit dopey-looking, and by series 2 even his haircut looked dopey. He also got everything wrong, and he could mangle almost any accent on the planet. He was built for Dick Van Dyke-style comedy, not a proto-Roger Moore.
There was also a splendidly ludicrous title sequence, which bizarrely refers to the 'almost legendary Ghost Squad' - why 'almost'? - and shows Craig emerging with a surge of commuters at what looks like Victoria Station in London, extolling his ability to merge with the crowd, while he stands out like a sore thumb, towering a foot taller than everyone else.