Sorry but this is pretty naive. The link you proposed is for a Chess variant. Now, in an abstract game like Chess, I may agree that using a square grid (and all

Sorry but this is pretty naive. The link you proposed is for a Chess variant. Now, in an abstract game like Chess, I may agree that using a square grid (and allowing diagonal moves) may be ok. In a wargame, though, or anything trying to "simulate" reality (e.g. a role playing game) using a square grid with diagonal moves will result in the "interesting" phenomena where moving your tank towards North-West would boost its speed by more than 40% (square root of 2=1.414...). And this would be even worse in case of favorable terrain like roads or plains. The reason why hexagons are favored is because they can perfectly cover a plane and at the same time you move a constant distance no matter which side you are exiting. So you should at least qualify your "overrated" statement by saying "for abstract games where speed/range of units is not considered an important feature".