Everything matters.
Gameplay, graphics... the whole thing.
Think about it this way, you may be all about looks with a woman, or you may settle down with a woman who may not look like angelina jolie, but has a great personality... either way... one of those have to matter.
Great games, with low graphics --- do you still think Pac-Man is fun... well there you go... She's like an older woman, simple, to the point, not all that great on the eyes anymore, but she's classy and classic. Like Diane Keaton...
But you could play something like Doom 3, she's hot, sexy, you cant wait to show all your friends you got something like her... but when you get her home, you cant have a conversation with her cause she's a bitch. Think, Vida Guerra.
There's always a give and take, and it's something you learn with age. You always end up sacrificing one for another, and there is very rarely an answer in black in white. Life is mostly in grays. Give it time, and in the meantime, play all games accordingly and make your own judgements.