How this thread feels right now:
People do like different things, and different traits and such attract them. Solas attracted me with a combination of good writing, personality, voice acting, and other things like the animated body language. And yet the romance itself is ultimately sad but story and lore relevant. I can say that making the decision to romance Solas during my first playthrough was the best decision i could've made. It sort of tainted the rest of the game with a certain sadness that I thought was a great thing. Other people were confused when I mentioned feeling sad after finishing the game.
But romances in games are a nice thing to have and in BioWare, something you expect. As far as what has already been said, there are reasons people are off squeeing about Cullen. It's a nice romance and it's very sweet. I was kind of dislike to indifferent about Cullen before. I like Cullen in DAI but because of his growth. As a player, I still remembered Mr. Kill All Mages.
In any case, fulfillment is a side benefit but it's not like most people are expecting in-game romances to be as fulfilling or full as real romances, but they're nice within the game and if fleshed out and written well and also anchored within the game, they can be just one more good thing about a game.