Couldn't agree more - not only is MM frigging fantastic, but that episode is the sort of explosive, divisive issue that the show didn't shy away from and would examine in-depth and from all sides. That's what made it so great in my opinion, and I think nowadays in particular it would stand out to a first-time viewer. When I saw some of those early episodes for the first time I just thought, "I can't believe that aired on network television." Abortion, race, religion, homosexuality - this show didn't back down from anything.
Sure, Trophy has some great acting and some neat guest stars, but at its foundation mostly it's this person slept with that person, conflict between this lover and that one...the same thing you see everywhere, and Law and Order for me was always (well, mostly) above that sort of thing. We all have our own personal lives, I don't need to see Jack McCoy's. Show me something outside the realm of my own experience - homicide investigation, legal proceedings, people grappling with life-or-death issues and struggling with their ethics and morals. There is the ethical quandry at the heart of Trophy, but I mostly feel like they just wanted to use the Jack's Two Lovers angle.