Movement in parallel projection

I'm trying to achieve character movement and camera behaviour similar to that of wasteland 2 and diablo 3 (on the console).

I think wasteland 2 uses a navmeshagent because it refuses to move at all when it can't reach it's destination and has a slight delay with any movement made. But google tells me I shouldn't use that because it would have to calculate routes even if it's only a slight movement.

I have no idea how to go about doing this. I want:

1. Walkable paths such as provided by nav meshes

2. No gravity needed because falling isn't possible that way

3. Controls will be gamepad or WASD

4. Camera doesn't rotate unless player uses right stick on gamepad

5. Player faces direction of movement

I hope someone can help me as this is slowly driving me insane.