Definitely. I always play in first person, and I hate it whenever the camera changes to third person. When sitting down, standing up, getting knocked over, all that. It breaks immersion, you know what I mean?
I agree with everything except for getting knocked down. It might get kinda disorientating watching everything spin in first-person, since it switches to 3rd, you can just get up, get your bearings quickly, and keep fighting.