I disagree that art makes or breaks games. I think it's really the design: difficulty balance, right number of mechanics, good progression, clever challenges etc. My most successful game to date was when I copied as closely as possible an existing franchise. Whenever I've tried to strike out with my own ideas I've never come up with a game that's very good at all. It's no wonder that successful indie game devs usually find that success by making a ton of games.