A native of the gamma quadrant comes through the wormhole and DS9 is put in a difficult situation.
This is a great episode for the development of Chief O'Brien's character and a decent take on the subject of hunting for sport inspired by 'The Most Dangerous Game'.
As a way of getting to know O'Brien and providing his a character with quality screen time it is excellent. Colm Meaney and the writers successfully portray him as the good natured, funny, hard working, heroic every man and comfortably leads the episode.
Sisko, Odo and Quark also have strong character moments. I particularly enjoyed Rene Auberjonois 'not hurrying' to track down O'Brien and Tosk.
As a Prime Directive themed episode it is reasonably good. There is an interesting dilemma for the characters to contend with and it's done in compelling way. However, for me, the outcome is fairly dubious. It is not clear whether or not certain characters were killed in a particular confrontation or not, but it implies they were, so I would hardly say it has a positive outcome from an interference perspective.
Visually works very well, with some superb makeup effects to help Scott McDonald portray the Tosk character.
It's a 7.5/10 for me but I round upwards.