Yeah real time DoF is redundant because your eyes naturally 'blur' the background when focused on a subject. I feel the same way with certain 3D effects like in Avatar.
Not quite, but you are correct that it really isn't necessary. I don't mind it for cut scenes because it gives greater cinematic effect to them.
For the regular game it is nice but it is an effect that must be allowed to be switched off in my opinion.
You say 'not quite' how so? http://en.wikipedia.org/wiki/F-number#Human_eye.
I'm not being combative, just curious.
In any case, I think the main problem with DoF in games is that it is overused as an effect. It really doesn't present value.
In photography and movies, DoF is primarily used to accentuate the subject(s) meaning, in (real)movies and cut-scenes a certain amount of DoF is acceptable because the subject usually takes up most of the screen. In game the DoF at times can take up more screen real estate than the subject itself, hence becoming distracting.
be used as an artistic element, hence in things like Bokeh, but it just is strange to use it all of the time.
I think we can all agree that we're glad it can be toggled on and off.