What's the MOST important factor for you in a screen shot?(any stlye)
(ex.-light, detail. color, shade, etc....)

Just wondering, Miine would be the action it portrays, or the story it tells.   
Anyone else?
This is not a poll, just a general question on artwork!

I don't think there is one answer to this question. Depending on the shot, there are different things that make it good. However, I think what can make an 'ok' shot become a 'great' shot can be the angle.

Composition is my most important aspect of a screenshot.  Where the objects are placed in relation to each other as well as the edge of the screen is critical in my opinion. Also, the picture needs to have anti aliasing.  Even if your computer runs like a slideshow with AA turned on (like my old laptop did), having it in a screenshot is essential in my opinion.