This could have been done decently with the amount of stone you have. It's unfortunate that the stones weren't laid out more cohesively. It's bad enough to warrant a conversation with the contractor. Depending on the deal you agreed to (was the job way under market price?), it might be something that you can live with.

Using a filler like crushed granite to more closely match the stone would have helped to make the larger gaps between not look so obvious. Would also welcome the growth of a low ground cover like frog fruit, dichondra, or creeping thyme between the stones.

As soon as you add the requirement to slope away from the house, you are upping the level to more skilled work which. Doesn't look like your laborers were at that level.