*facepalm*
Every single screen grab you do that is zoomed in depends solely on what you have set the zoom function to in either the trackpad or mouse preference under system preferences. That picture you posted zoomed in proves that there is absolutely no difference. Here is a picture from MY early 2006 Core Duo MacBook Pro with smooth images while zoomed in off:
(Click the images to make them larger)
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Flip the switch...
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and you get this:
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plus:
macbook pro -> video card -> screenshot --> lcd --> photography.
So, if the screenshot looks ugly then its pointless to blame the lcd, the screenshot is obtained before the signal reach the lcd. Just common sense.