The main weakness of this text is that many interpretations are exaggerated and you'll find death, dangers, prisons and generals, kings, fame very, very often. It is something characteristic for the old astrological texts. I think this can be overcome by trying to understand the essence of the prediction and not to take it literally. Let's see an example:

"Mars in the seventh house, that is, on the descendant, indicates the greatest evils and enormous perils. He will make the natives suffer as criminals and murderers, be defendants accused as discoverers of new crimes; or they will be torturers, executioners or informers."

Then another interesting part follows, where are analyzed the conjunctions of the planetary pairs made in every house by Mercury with the Sun, Saturn, Jupiter, Mars and Venus. The final part of the chapter presents the conjunction between the Moon and Pars of Fortunae placed in different houses and with different aspects. It is, in fact, a preamble for Liber Quartus.

LIBER QUARTUS

This chapter is almost entirely dedicated to the analysis of the Moon symbolism in the natal chart. This reveals the importance of the Moon in traditional astrology and gives us plenty of information to use. Are presented the interpretations of the aspects made by the Moon with Saturn, Jupiter, Mars, Sun, Venus and Mercury. The analysis shows all the situations when the Moon is waxing or waning and the chart is diurnal or nocturnal. 

Another part reveals the meanings of the conjunctions of the Moon with other planets on angles and the position "void of course". 

Also, great importance is given to the planet with which the Moon makes the last aspect and the first aspect, more clear, the planet from which is moving and towards which is moving. Especially, the first aspect that will make is very important. This technique is characteristic for horary nowadays, but the ancients used it extensively for natal charts. I think it is a very important issue in the natal chart and we should not overlook it. Let's see an example:

"If the waxing or full Moon is moving away from Jupiter toward Venus, the parents will have great position and power; but the native will be estranged from them or early become an orphan; nevertheless, for him power, fame and high position are indicated, but all over a period of time. Great good fortune also is gained through wives. These men are handsome, pleasing, and charming and obtain power through their grace and charm." 

Other subjects from this chapter are the part of fortune, the part of daemon, the ruler of the chart, the climateric years, occupations, empty and full degrees and masculine and feminine degrees.

The method to determine the ruler of the chart it is certainly strange, from my opinion: the ruler is the planet which governs the sign where the Moon enters after she has left the natal sign (the next sign from her natal position). I don't know what is the reason behind this algorithm, so I don't give much credit on this technique. Still, the interpretations for every ruler - planet are valuable because we can use them even we found the ruler using another method. 

About the occupation Firmicus considers that one of the planets Mars, Venus or Mercury indicates what will happen. One must select the planet which is on MC, in trine with MC or in angle. Hmm... Again an unusual technique for most astrologers.

LIBER QUINTUS

Here the author presents the interpretations for the Ascendant and planets in every sign. Because in traditional astrology were used Whole Sign Houses, when the Ascendant is in a sign, automatically we know where is the Descendant, MC, IMC. Delineations for every aspect are made in the same manner like in the former chapters: detailed, clear, related with other planets position, exaggerated.