See this thread that appeared on 8pol (and is now archived on zigforums):
. Rome imported a lot of non-whites and that, along with concentration of wealth in the hands of a few, resulted in the downfall of the empire.
Major factors in the decline of the Roman Empire were the concentration of wealth, the absence of mining deposits for industrial production, and the vast importation of non-White slaves with the resultant degradation of the genetic value of the nation. By the 4th century AD, as a result of the continuing decline in Roman female fertility, slaves outnumbered citizens by five to one. The most important economic reason was an inadequate supply of an inexpensive circulating medium of money and the false notion that money should be a commodity. Thus from an economic perspective,the lessons from the fall of Rome are that a dishonest economic system will inevitably contribute to the forces of dissolution. No society can survive a false economic system. For any society to function and prosper it is absolutely fundamental that the means of exchange be issued free of debt and interest by the legal authority of the state as representatives of the people in perpetuity.
 “When the Government of old Egypt fell, 4 per cent of all the people owned all the wealth.When the Babylonian civilisation toppled, 3 per cent of the people owned all the wealth.When old Persia went down to destruction, 2 per cent of the people owned all the wealth.When ancient Greece fell in ruins, one-half of 1 per cent of the people owned all the wealth.When the Roman Empire fell, two thousand people owned the wealth of the civilized world.Then followed the Dark Ages, from which the world did not recover until wealth was nolonger concentrated. Today less than 1 per cent of the people controls 90 per cent of thewealth of these United States.” – as quoted in R. Maguire, “Money Made Mysterious”,American Mercury magazine, New York, 1958, 98. (American Mercury was founded by H.L.Mencken in 1924).
Goodson, A History of Central Banking and the Enslavement of Mankind
Ben Klassen also mentions in his book, Nature's Eternal Religion, how the Aryans eventually mixed away in India, Egypt and Rome. America seems to be simply another iteration of that.
So if you're asking if Rome was "good or bad," my opinion is that if you're going to build an Aryan empire, you have to keep it Aryan, repel Jews, and castrate slaves, otherwise history will repeat itself.