Let's see...

Huh, not a lot of game's I can bring to mind had developed romances that you could make choices about...

NWN etc.: I enjoyed Aerin Gend, and Linu, but I really wanted more development with Tommy. Expansion content, I'm fond of Valen.
NWN2: Deeply disappointed that the romance line for Neeshka was cut and incomplete. Bishop and Cas never really did it for me, either of them. I wanted to hang out with Sand more.
To My Great Shame: I've not actually played MotB, despite being told I simply must many times by others... I keep meaning to, but haven't. But I have heard a lot about Gaan and Safyia both, and they both sound like folks I'd like to get to know better...

Kingmaker: Angel boy was sweet, but not really my type, and Octavia and Reggie were... a project, that really needed to get themselves healthy *before* getting me involved, so it wasn't the most healthy relationship progression, which kinda made it feel not so great. I'm all for poly rep in games, for obvious reasons, but they didn't portray it as well as I'd have liked - or rather, they showed the difficulties that come of insufficient communication and understanding. Mostly I was just put out that the two individuals I'd liked to have had romances with - Linzi and Jubilost - were both put off limits by the game. Owlcat has something against romancing smalls characters. *grumbles*

I always appreciated that a lot of final fantasy games have romance/flirtation variables that affect certain dialogues and scenes, but I'm continually disappointed that they ultimately don't let you derail from the story-book-mandated romance that they pick in advance.... You can Tell Riku that she's more your type, over Yuna, but it doesn't actually change anything in the story. Sadness.