Something I have noticed over the last several months binge watching the first 5 live action star trek shows, I think it was a winning formula to involve the Romulans in an episodes storyline. I can't think of a single episode that wasn't great that had Romulans, even in a small capacity. They almost always create episodes that are sci fi political thrillers and episodes filled with tension. DS9s Romulan episodes were the best, In the Pale Moonlight, The Die is Cast, Inter Arma Enim Silent Leges, and the most underrated The Visionary. Nothing beats a Romulan thriller episode where Obrein is also tortured. The obvious standout from TNG for me was The Defector. Even the rare appearances on voyager and enterprise were very strong episodes. Is there any Romulan episode that was a stinker or were they all bangers? As far as I remember, they're all great.