well, Minecraft was quite successful
I'd say the gameplay side of things needs to be rather impressive to compensate for a bad presentation, but that certainly also depends on the genre. You'd probably lure in a much wider audience if you had some nice visuals to accompany your game. Think of all those abandoned Kickstarter RPGs that collected many thousands of dollars with only some fancy artwork and fake screenshots
I'd say the gameplay side of things needs to be rather impressive to compensate for a bad presentation, but that certainly also depends on the genre. You'd probably lure in a much wider audience if you had some nice visuals to accompany your game. Think of all those abandoned Kickstarter RPGs that collected many thousands of dollars with only some fancy artwork and fake screenshots