Default movement was pretty out there, but after they patched in alternative movement it was alright. Its stopped being an active negative point.
But this is still not gameplay. Gameplay is the totality of the game's systems actions and reactions. The movement, the difficulty of the game, the missions, the objectives, the inventory, the item placement, the enemy encounters, the potion system, the dialogue tree, the dialogue ramifications, the choice and consequence system, the flow of the game, the artificial intelligence, the leveling up system, the sign system - this is what the gameplay in Witcher 3 is. For some reason, the bulk of gamers have no idea what gameplay is. Its either the clashing of swords in a game like witcher or the act of releasing a bullet from a weapon in a shooter. Seems all games are reduced to a singular act even when they have a hundred different systems in place.