For this question, let's first look at what Qin Shi Huang did after the unification of the Six Kingdoms.
1. Unified monetary weights and measures to bring convenience to business development
During the Spring and Autumn Period and the Warring States Period, the weights and currency of each country were different, each country had its own characteristics, after the First Emperor unified the six countries, the currency was divided into two kinds: gold is called the upper coin, with the unit of ytterbium (Qin system 20 two for the yttrium); copper coin is called the lower coin, unified into a circular square hole, in half two units. Gold coins were mainly for the emperor's reward, and copper coins were the main medium of circulation.
In terms of weights and measures, the original Qin state units were used as the standard, eliminating the system that did not conform, and the inscriptions were inscribed on the standard instrument promulgated by the Shang martingale, and the batch production was sent to the whole country, as long as it was different from the standard instrument, all of which were invalid.

2. The car is on the same track, the book is the same text, and the traffic culture is not wrong
During the Warring States period, the shape of vehicles varied between countries. After Qin Shi Huang unified the whole country, the width of the fixed car was six feet, and one car could pass through the whole country.
In terms of writing, due to the large number of folk texts circulating, there are still local differences, which seriously hinders the economic and cultural exchanges between various localities, and also hinders the decrees issued by the central government.
Based on the Great Seal of the Qin State and combining the advantages of the tadpole strokes in the Qilu area, Li Si created a new script with simple strokes and rounded and neat shapes, called Qin Seal, a famous small seal, as the official standard script, and was not allowed to write other fonts. The unification of writing is an important summary of the development and evolution of ancient writing, and it is also a major text reform, which has played a vital role in the development of culture.
3. Strengthen the centralized system and lay the foundation for feudal dynastic rule
The first to be called the emperor, the establishment of central institutions, the establishment of local institutions, the casting of jiuding, the production of the national jade seal, this is the work that Qin Shi Huang did after he ascended the throne to strengthen the centralized system, thus opening the foundation of the rule of the feudal dynasty, and later generations of emperors have followed the practice of Qin Shi Huang in order to be able to pass on this inheritance.
To sum up, in fact, his ideal is very grand, the unification of the six kingdoms is only a beginning, he wants to continue to make this foundation bigger and stronger to glory, but he looked up to the productivity of the society at that time, built a large number of civil engineering and the Great Wall, built a number of palaces and his own imperial tombs, this is a measure to work hard and hurt the people's wealth. So that at the end of the period, after the uprising of Chen Sheng and Wu Guangzexiang, various princes followed suit and died in the Qin state.
To say that his ideal should be to be able to pass on the throne from generation to generation, after all, the work he did was to benefit future generations, achieve the great cause of the empire, promote the development of society, and promote the process of civilization. I just don't know if he knows it underground, if he knows that Zhao Gao Huhai will murder his eldest son Fu Su and usurp the throne and seize power, will he have a heart attack?
In fact, for the merits and faults of Qin Shi Huang, there is no real standard to judge, according to Ming Jingjun's view, it should be more meritorious than excessive, promote the development of society, and promote the process of civilization, which in itself is an indispensable thing. As for the search for immortality, this should be something that everyone hopes for, and the burning of books is a necessary process for social development at that time.
The merits of the First Emperor, in thousands of generations, perhaps this is also part of his ideal!