No. Most of the time people judge games by something new that they do (minecraft for example). Graphics do help but if you don't have a big wallet to advertise them there is really no point. Besides there is no in game settings for Anti Aliasing in blockland so its hard to marvel shaders when everything is so damn pixelated.
Actually, Some of the majority now decides the game by both, They decide about how "Flashy" or "Shiny" the graphics and game is without taking into account the other more important details, Some make the decision because of pictures or because some other person they enjoy is playing the game, Although unfortunate that's how it works now.