The phrase "decent fist" means doing something fairly well or with reasonable competence. It implies that the person or thing being referred to is satisfactory or acceptable but not outstanding. Full definition
Burnley are a Championship club but they were in the Premier League last season and they made a decent fist of staying up after a very slow start. (justarsenal.com)
Ronaldo, Hazard, Reus, Neymar and Pires (amongst others) have made a decent fist of having a starting position left of centre on the pitch so I would not write Ozil off too soon as an option. (justarsenal.com)
But while The Fugitive made a decent fist of using the encounters to accumulate tension, this feels extremely episodic. (rottentomatoes.com)