Anyone wanting to see the new show would be well-advised ro watch Nemesis first.
"Q Who?", "The Best of Both Worlds", "Family", "I, Borg", "Descent", "Scorpion", "The Gift", "Dark Frontier", "Endgame", First Contact, and Nemesis would probably all do it. If you need more TNG Romulans, throw in "The Enemy", "The Defector", and "Face of the Enemy" that would do it.
Funny thing about Picard. In TNG, the Romulan's re-introduction in "The Neutral Zone" had them wondering about damage to their worlds that was later speculated to be from the Borg. Now we'll have Borg and Romulans, and...
Romulans occupying a Borg Cube. Instead of fearing Borg tech, they have access to it and have possibly harnessed it. Which is a completely different spot from where they were in TNG.