Deus Ex' environments are pretty varied, from wide open landscapes to clausterphobic tunnel crawling. All this eye candy comes at a price however, high system requirements. First off, forget the minimum suggested system requirements. I would even go so far as to say for a good play experience you should have a G4 system. Just let me say that your choice in methods of taking out an opponent is impressive.
Weapons come in different classes.
There are low tech weapons like swords, knives, batons, and an electric prod. The baton can be used to cudgel an opponent unconscious, while the prod will stun an opponent temporarily. A second shock will put a human out of service. Swords and knives obviously kill an opponent. The fact that you have a choice is important because you are theoretically a good guy.