Most of the units are pretty decent; it's only the swordsman and caravel that are excessively stylized to the point of looking silly. The shapes of the buildings don't bother me (the city buildings in Civ V are extremely primitive and ugly).
What I find most disappointing about the terrain and structures is the relative lack of texture. This may be for technical rather than aesthetic reasons, but I think that (and the saturation) is the main factor that gives the impression of a kid's game or a mobile game.
What I find most disappointing about the terrain and structures is the relative lack of texture. This may be for technical rather than aesthetic reasons, but I think that (and the saturation) is the main factor that gives the impression of a kid's game or a mobile game.