Thanks for the comment...
Of course the technological achievements of medieval ages cannot compare with the roman or the greek ones (but what about art or philosophy or law or rights. Compare for example the trials in ancient Greece and in medieval ages or the level of political or human rights... I mean even the first banks and the first derivatives and the first innovative products of financing such as leasing and factoring were developed in ancient Greece and then in Rome)... I believe that the legacy of Greek and Roman civilization is far greater than the medieval one.. Maybe it could be compared with Renaissance (IMO the peak of medieval ages), which is also late medieval ages... but Renaissance is mainly considered as a different era than medieval ages, despite belonging to them...also Renaissance is primarly based in Greek and Roman tradition (with the Fall of Constantinople scholars and books from Byzantine about Greek and Roman culture immigrated to Italy and to the West..) Homo universalis was the evolution of the greek and roman citizen, who was far more educated and cultured than the medieval one.
So, when I say that the technological achievements of greek-roman are more/greater than the ones of medieval civilization, I speak about a mutatis mutandis comparison. But IMO, in the intellectual-political sector the medieval civilizations are inferior to the greek-roman ones even in a straight comparison.
In political structure we have indeed more lasting governing forms but feudalism or monarchy still is inferior to democracy or senate or other complicated governing systems, which include though democratical elements, such as discrimination of powers etc.. Also any type of democracy is far more fragile than a totalitarian regime.
Of course, I didnt form my opinion from Game of Thrones and Lord of the Rings, despite the fact I really love them!

However, for me LEGO is all about knights, castles and dragons! But I will surely entertain a break with a new LEGO series with a greek roman theme... Spartan warrior and Roman gladiator were amazing!