It's hokey here and there. The whole "long lost brother" bit is silly as hell, and the only surprises here with it are that they used it at all--and that it takes Sharpe so long to figure it out. Also weak beyond belief are Mrs. Sharpe and her paramour, Lord Rossindale, who both came right out of Central Casting and aren't acted well enough to bring anything but the cardboard cutouts. Finally, while "Sharpe" episodes aren't known for subtlety, "Justice" goes way overboard with the black-and-white, good-and-bad. There's no middle ground here: Either a character is Good or he/she is Evil.
Still and all, there's good here too. Sean Bean created Richard Sharpe, and he's got the character down pat. Everything is right about his performance. Minus the constant battles of the earlier episodes, his character is developed and exposed in a way we've never seen before. Also excellent is the eternal sidekick, Sgt. Harper. There's more camaraderie between the two than ever before, and it's quite nice. Even Daniel (the singer) gets good screen time and decent attention paid to him for the first time in the series; his momentary disloyalty and later apology show us how worthwhile his character might've been over three seasons if he'd ever gotten the chance.
It all--episode and series--ends with Sharpe off to Normandy and Lucille, Harper off to Ireland (where's Ramona?) and Daniel staying with the locals in Yorkshire because he's got no place else to go. As they split up for the last time, it's a sad thing, knowing there'll be no more "Sharpe"s, and though you wish this last one had been better, it's a solid enough way to say goodbye.