Can you summarize? From the bit I recall offhand, she has to grow her nails very long and some other requirements. Also, under what circumstances can he even bring home such a bride?
There is also a waiting period before he can proceed with the marriage (for the purpose of hoping he will reconsider his decision to marry her as it is not a good idea.) It also says the children she bears will be bad.
You got to be an idiot to marry one of them, an ?????? ????? ?????? , especially when there are so many wonderful Jewish Bais Yaakov girls around. This was basically a one time dispensation for a righteous soldier to satisfy his yetzer hara in battle, but the Torah discouraged him to marry her.
Notice that the section on yefas to’ar is right next to the section on the rebellious son. The commentaries say this is deliberate. If you marry someone only for physical gratification it will wear off, and you will come to hate her. From that situation will come a son who rebels against the Torah. It was only permitted as a sop to the Yetzer Hara, and I doubt that many soldiers actually used it.