I thought it was a powerful and moving episode, a classic Trek examination of an impossible dilemma with no "right" solution. Top-notch performances from the cast, great direction, wonderful music (Velton Ray Bunch won the Emmy in 2004 for this score). The scene with Sim and Porthos choked me up, too.
It's in my top three, along with "Observer Effect" and "The Forgotten."
oh, yes, this scene between sim and porthos! so simple and so moving in the same time. i love this scene.
and yes, don't forget LeVar Burton who have done a terrific work.