These "top 50" lists are, of course, wildly subjective, but this one actually includes older shows (Dragnet, Gunsmoke, Bonanza)... and any list that has the Fightin' Adamas at #12 (one notch behind Deadwood) is okay in my book.
http://television.aol.com/insidetv/2009/03/11/50-best-tv-dramas-ever/?icid=main|main|dl2|link3|http%3A%2F%2Ftelevision.aol.com%2Finsidetv%2F2009%2F03%2F11%2F50-best-tv-dramas-ever%2F