Coming after such a great episode as 'Mac's Back' would always be hard to top, but 'The Legacy of Garwood Huddle' is a definite step down, and one of the show's weaker stories.
As has already been commented, this episode always struck me as being shown out of sequence, as Magnum has long hair in this instalment, but had it cut in 'Mac's Back'.
The story starts off with some potential, with an aged robber having broken out of prison to find the ransom for his kidnapped grandson, but unfortunately it soon goes downhill, and is downright dull in places. Sadly, this would be the case for many episodes of the fifth and sixth season.
Pat Hingle is an okay guest star I suppose (he reminds me of Eugene Roche, who plays the recurring Luther Gillis), but I just had very little interest in Garwood, which is not a very good sign in a story where you should be rooting for him.
Also, I guessed who the villain of the piece was straight away. I won't give it away here, but I personally found it very obvious.
A nice touch – and probably the best element of the story – is the aftershave sampler that Magnum tries on, making him reek of "brussel sprouts" and "old gym shorts". This is the only truly humorous moment of story; The familiar spark of the series is definitely missing with this one.
For all I've said against it, I wouldn't say this is one of my all-time least favourite episodes, but is a definite notch down from proceeding stories (especially when watching the show on reruns or DVD without a break from the fourth season, which also had some strong episodes at the end). At best, it would be down the end of a season to bump the year's episode count up – it certainly has a 'filler' feel to it – but placed so near the start of the season, and after such a classic episode, it really suffers.