MK World looks genuinly awful gameplay wise. The tracks are even wider than in MK8 and are mostly straights. The whole gameplay looks very boring.
Mario Kart has always been about driving, drifting, optimizing driving lines and stategical use of items and shortcuts, which made it an awesome and exciting fun racer.
But, please, look at this... Mario Kart World has been dumbed down so much, that it lost everything that made "Mario Kart" great. I think Nintendo did this to please 5 year olds, who aren't able to do much more than press accelerate and drive in a straight line.
And Nintendo is really charging 80/90 dollars for this? Just wow...