Nobody will ever call this episode a series classic, but the series was strong enough at this point that it could crank out good-to-very-good episodes on a regular basis.
The strengths of this episode are two-fold. First, Jeff McCarthy gives an understated but strong performance as the rogue super-soldier. That makes up for a fairly unconvincing Troi performance by Marina Sirtis.
Second, the lengthy action sequence near the end of the episode is, as one of the reviewers notes, among the best in the series. Because we don't realize Danar's escape plan until the very end, the suspense keeps us on the edge of the seat.
Third, the ending of the episode wraps things up nicely. I particularly enjoyed the snarky comments from Picard about the Angosians.