In those two episodes I think they did more to make the Romulans seem interesting than in most of their appearances in subsequent series IMO. Sorry, I guess I'm jus holding a drudge for the formulaic "forehead-uniform-okudagram" aliens of the TNG+ era. While there were some exceptions, most of the aliens depicted were simply based on swapping around those three things. The only halfway interesting thing they came up with was in Unification - but that arc was never touched again (maybe the new movie deals with it within the constraints it has - but i don't think they'd have room for that)