Well guys, it has nothing to do with the display technology and everything to do with scaling.
Scaler
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SD - Standard Definition on your HDTV
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Overall scaling has improved within the display and also from our sources. That said I see more errors with display scalers than source scalers. Getting 480P to the display at minimum helps alot. There is the rare bird that performs well with less than 480P such as...
Review Toshiba DLP RPTV 44NHM84
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For the most part these days it is recommended you set your source so it outputs SD content at an HD scan rate so the source does the scaling. The only issue with that concept is depending on the product you lose the ability to format. Those that will format HD scan rates will require using the internal scaler which is likely to introduce artifacts again.
So, in the end, nothing has changed... If SD performance is your concern then you should include an external scaler in your budget with many hovering at $1000-1500 and used ones running even less. If you are not satisified then you are prepared for a solution.