I think people also focus too much on the offensive numbers when comparing the two teams. Defensively, its not even close. The Dream Team had 5 of the top 10 all time in steals (Stockton, Jordan, Pippen, Drexler, and Malone). Robinson, Malone, Ewing, and Barkley were all better rebounders than anyone on this team. Robinson and Ewing are both top 10 all time in blocks.
Also, I think you've got to factor in attitude. The Dream Team didn't just want to win. They wanted to humiliate you. They were on a mission to prove they were the best in the world. Heck, even though winning was a forgone conclusion Jordan still studied game tape of Angola before their game.