Impressed by effects? :think: As much as I can understand but my advice is to get over it. Technical effects don't make a good picture, it can only support what is there already. The term here is "subject isolation" by using a selective focus only on the subject, leaving the rest in (more or less) blur, unsharp, out of focus. It's one element of image composition.
Aperture helps here, since it is one factor defining the Depth of Field. Other factors as mentioned: focal length, distance to subject, distance from subject to background. Bokeh is, finally, nothing but a subjective judgment how pleasing those parts of the image look that are out of focus. So why are you focusing on something that is supposed to be out of focus?
More to read about Depth of Field: http://www.cambridgeincolour.com/tutorials/depth-of-field.htm
haha.. i catch no balls.. i am just a regular shooter so i will be amazed by bokeh effect.. of cos not everything use bokeh effect.. but some object when taken need bokeh effect to make it stand out mah.