Board Thread:Suggestions forum/@comment-213.93.103.80-20170520200209/@comment-32052706-20170520211651

Well I can think of reasons why they are small- Orc and Dwarven Battle Axes and Hammers- These are quite small creatures so to fit their size they make weapons small than them. And for Orcs, Sauron had many Orcs at his disposal, he might have the army but not the resources, so he gives a portion of the steel to the Orc weapons.

But men and Uruks can handle the size of their weapons so thats why it's big.