The way you phrased your query
is you want the bokeh, to isolate the subject .
However, the amount of Bokeh you can achieve is not limitless, to a great extend it is limited by your lens.
So I reckon we are talking about the æsthetic quality of the blur more that how blur is the blur.
Meaning how well the Bokeh complement your shot.
The quality of the Bokeh depends on alot on the type of lens , design , the aperture, the aperture shape and the backdrop.
Depending on the focal length, some lens design ,aberrations, aperture shape and background can cause the bokeh to merge in a way that is pleasing to the eye or Good Bokeh. In general, Good Bokeh the transition between the out of focus edges of shade are gentle and creamy. Good Bokeh with shades that complement the subject, the degree of blur will depends on its contrast with and how it can complement the subject matter. More blur might not be neccessarily good as the shades of color of blur will changes too with increase/decrease in the bokeh.
Certain combination of lens, design , abberattion, aperture and background produce Bokeh that is unpleasant, distracting, bloctchy or Bad Bokeh. This type of blotchy Bokeh tends to distract and draw attention away from the subject . If you have Bad Bokeh, and assuming you are at wide open aperture , forget aboout it, no amount of how blur is the Bad Blur is gonna enhnaced your shot. Assumming the Bad Bokeh is enviromental, shifting your angle slightly to change the backdrop might help.
Cheers!