Gameplay will always be something I would have favoritism over simply because if a game with a good narrative/story can make the experience enjoyable, it's going to be something memorable. Depending on how big the developing team is, sometimes you can find the smaller and underrated teams that make awesome narratives/stories, but have yet to make any awe-inspiring graphics. Of course, I guess that's a matter of opinion since the bigger the group thinking for a narrative, the more likely the game may be better story-wise. But there may be people like David Cage who ends up making games where you're wondering where the gameplay and script are in the first place.
Honestly, if the game is so realistic, sometimes I get more concerned about where to head to next because sometimes it makes me think the game is like a Sandbox game where anything can happen. I admit that sometimes the attempt realism can get one in a state of trance and literally in the moment, but if the gameplay is horrible, I'm going to turn it off without a moment's hesitation.