I have a confusing relationship with the Romulans in Trek. They're such a fascinating idea, but the execution is so often very poor.
- Balance of Terror is an absolute classic;
- We won't discuss the other TOS Romulan episode, because it was given the Third Season Treatment;
- The Neutral Zone appears to set them up as TNG's new villains because the Ferengi are crappy villains and the Klingons are our friends now, and it does so in a terrific way;
- Unification is one of TNG's best two parters;
- Face of the Enemy is also pretty good;
- The recurring role the Romulans play in the Klingon Soap Opera of Gowron, Duras and Worf is ... yawnable;
- and then there's Nemesis. Oh god.