The mod is good but I can't say the warriors are really accurate to lore, especially Gondor.
Gondorians are descended for the most part from the people of Numenor. Due to this, they tend to almost uniformly exhibit certain physical characteristics, which holds especially true for the folk of Anorien, Belfalas and Ithilien. People from these regions are tall and fair, with black hair and grey eyes.
Those from fiefs such as Lamedon, Lebennin and Anfalas can, however, be somewhat shorter and swarthier than the average Gondorian, with brown hair and eyes. The reason for this is their blood is mingled with that of the hill folk who lived there before the coming of the Dunedain.
During the Third Age,Gondor's military prowess eventually weakened. The soldiers used two different types of armour and shields. The first one was the same as the ones used in the War of the Last Alliance and were still being used when Gondor was ruled by the Kings,however when Gondor was ruled by the Stewards instead of Kings (this was during the second half of the Third Age), this caused their armour and shields to change.The shields that they carried changed and was only about half the height of it's user which was made of metal. Their armour was affected as well, for it was made out of a thin layer strip of metal that would block against a few attacks, unlike the one used in the Second Age which could block many attacks. The weapons were the same (ex. spear, sword, bow and arrows) throughout the Third Age. Another major difference was their soldiers: although the soldiers would have proudly fought to the last man, they were never as strong as the warriors of the past especially by the second half of the Third Age. After the Great Plague and the Kin-strife, which left Gondor very weakened, the Gondorian troops mostly consisted of regular soldiers for the rest of the Third Age. Many Númenóreans of pure blood had perished during those troublesome times.
So they did wear plate armour (those who gained a high enough rank) but it wasn't exactly tough enough to withstand many blows.