Moving units has become a tedious PITA, and the "Go To" function has become not only useless, but actually dangerous to use. To stop the inherent problem of units clogging the map, individual units have been made too expensive, powerful, and valuable. Meaning that a correctly used small army can conquer the whole world. Because you can't stack units in cities for defence, the cities themselves have been made ridiculously powerful, making garrisoning redundant. A city with walls can easily hold off most AI armies. This makes it even easier to conquer the world, as there is no need to garrison your own or captured cities. The AI in Civ4 wasn't exactly brilliant, but it knew how to build stacks and use them, and as such could be a formidable opponent, especially on higher levels. In contrast, the Civ6 AI is completely unable to execute either attack or defence with 1UPT, meaning that even when it starts a surprise war against you, with massive superiority, you can roll it like a cheap fag. Because 1UTP is apparently incompatible with transports, land units have been given the ability to swim, whilst apparently retaining their strengths. This leads to epic infantry battles in the middle of the ocean, and effectively makes naval units redundant. The lack of stacking makes anti-cavalry units pointless (if you'll excuse the pun) so they have to be given their own offensive strength which is nonsense. Because you can't stack ranged units, they have been given stupendous range to enable them to fire from the hex behind. So you have ancient archers apparently able to hurl the arrows right over an entire city. But this in-turn creates line-of-sight problems, which in reality would never be an issue. Because you can't stack them, barrage weapons have been given melee strength to enable them to stand alone. WTF? I also blame 1UTP for the stupid situation with Builders. Presumably to stop your builders clogging the whole map, they now build things instantaneously, and repair improvements for free. But to limit their usefulness, they expire after 3 builds. As a flow on from above, because Builders are now too valuable to waste building roads, roads just magically appear if you have a trade route (or if you are Rome) AND magically upgrade. NB: The reason I ask "ruined the Franchise?" rather than "ruined the Game" was only meant to acknowledge that it was also present in Civ5.