I did the same many times:I spent quite a bit time at the Apple Store staring at the retina and non-retina Macbook Pro's and I couldn't see any difference. I do wear glasses so maybe my vision isn't that great.
* The non-retina is brighter and you don't need to maximise the brightness.
* The retina is nice, text is crisp,... bla bla, but the glare is annoying and mission control sadly lags. My Late 2008 performs better with ML!
A number of people don't care a **** about retina, they just buy it because it is so cool!A funny thing happened when I was there. I was looking at the non-Retina 15 and two teenaged boys came next to me and were looking at another non-retina 15 Macbook Pro. They were talking about how amazing the Retina Macbook Pro is while looking at a non-retina Macbook Pro! I found this very amusing.
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Something must be wrong with your particular unit, as I have a 2.6 GHz model without even a hint of the slightest lag anywhere, no matter what I'm doing. Safari 6 scrolling is almost too fast for me.
Why Apple doesn't bother to explain what the **** is going on with those "wrong" units? Aren't they manufactured in the same factory in China?