Honestly the game could be potato quality in the graphics department but if they have nailed the strategy / core game then I wouldn't care. I'm surprised how many people are bothered so much by it. It's why Civ 4 is still so popular, the strategy in a 4x game is way more important than the eye candy. But I'm not agreeing that it's a bad looking game; personally I love the stylised "cartoony" graphics, it's very vibrant and refreshing.
Only thing right now I'm praying for in Civ 6 is good AI. Civ 5 wasn't bad (well, eventually, was horrific at the start) but it was too predictable and the difficulties levels were so cheesey. AI didn't get any smarter, it just got a headstart.