I'm still trying to come up with a good romance in an RPG, even after all this time. If I had to give some bad ones though...

Zael and Calista from The Last Story. It has all the worst trappings of a bad JRPG romance subplot. Both are incredibly cliched, both have zero personality, they meet Aladdin style and instantly fall in love in one of the most awkward moments in the whole game, and like every notoriously bad romance subplot in an RPG, the damn romance becomes a plot tumor that slowly overtakes the narrative. It has moments of being really cute or interesting, but quickly dashes away any of the pretext of it ever becoming more than a cliche storm really quickly just in case you thought this 16-bit romance would ever upgrade to the modern era the game was released in.

Cloud and Tifa from FFVII. Oh yeah I hear the pitchforks and torches being readied, but hear me out. The romance starts off really cute in the beginning, with both chilling as childhood friends with a possible hint of something more, and even ignoring the possibility of three other dating options, it looks like these two could be the one true pair. That is until we get to really see their backstory and realize they hanged out together, but didn't really know each other. Cloud had a huge almost stalkerish crush on her, but Tifa actually didn't know who Cloud was until their infamous Water Tower promise, which is when Tifa herself develops some weird warped idea of their romance as well. People often cry foul of Aerith trying to rekindle her romance with her dead boyfriend through a proxy like Cloud as creepy, but honestly, Tifa's motives and history of liking Cloud are largely on the same shakey ground and leads me to believe the two could never have a real relationship because it's built on a fantasy by two people who have a tenuous grip on reality as it is. Their relationship is akin to picking out a classmate you grew up with who had a crush on you that you only learned about years later, and deciding for no real good reasons that they were "your one"despite the fact you probably never really knew this person intimately beyond going to school with them. That's not the basis for a good relationship. Granted, I feel like most romances in FF are not terribly good, but this is one that fans seem to push as a one of the good ones and I have to disagree.

Romances in any game where you can choose your partner. Like Rez09 mentioned above, there is something too scripted and artificial about the experience. It's fun to choose who your character hooks up with, but often I find the romance itself is kind of shallow.