Hard, but not unthinkable. I remember hating the art direction for Civ 5 when I first saw it.
Coming from 4, I thought 5 looked needlessly muddy and cluttered with washed out colors that would make the map difficult to read when zooming out, but I eventually got used to it because I liked the changes they made to the gameplay.
And that's really the meat of it. If the gameplay delivers, this time next year you'll see people forgetting their reservations about the art and instead sharing stories about the game itself.
But it's as people have been saying, there's nothing else to really talk about right now.
Same here. I for one welcome a return to stylization. Are the colors too bright? Sure. But otherwise I think it's a much better fit for the franchise than Civ5's "realism." Some people are convinced that realism is the highest goal of any artform, when it's really not.