Even in a Somerset side coming into a successful period, with high-profile players, notably Viv Richards and Ian Botham, Marks at times stood out, especially in List A cricket.
In a series decider, Marks made two crucial interventions at tense stages, dismissing Sikander Bakht and joining Bob Taylor in the partnership that clinched victory.
His strength in limited-over cricket made him an important member of the ODI squad during the 1980s, appearing thirty four times and taking forty four wickets at a bowling average of 25.79.
As a cricketer he was popular and well-liked; Wisden editor, Matthew Engel, labelled him "a mild, nervy, self-deprecating farm boy with an Oxford degree and no enemies".
This was an unusual distinction in the Somerset side of the 1980s, where three explosive personalities, Viv Richards, Joel Garner and Ian Botham, had a dispute with captain Peter Roebuck, which resulted in Somerset (under the influence from Roebuck and new club Secretary Tony Brown) opting not to renew Richards' and Garner's contracts in 1986, and Botham leaving the club in protest.
While he was never a fashionable cricketer, he was a determined and highly effective off-spinner-cum-batsman whose Test figures stand comparison with those often picked ahead of him, such as Geoff Miller and Eddie Hemmings".