Wow, if you're struggling to beat bob barbas on human, the camera being fixed is the least of your worries. I assume you're talking about when the camera zooms out to an extreme distance to mimic helicopter news footage, I have no idea why you'd have difficulty there since the camera is so far out that you can see everything at all times. Fixed cameras with constant changing environments is what is inexuscable, like you're running forward and suddenly it switches to different angle so you run back from the environment you just ran forward from. I always prefer a controllable camera, but at least in DmC's case its for a specific reason, and it is so wide out that you can see every enemy trying to attack you Basically, as long as its wide enough so that left remains left and right remains right a fixed camera is not an issue.
Also, maybe if you'd learn the controls, the game would be a lot easier, and your experience less "awful."