The year is 2052 and the world is a dangerous and chaotic place. Terrorists operate openly, killing thousands; drugs, disease and pollution kill even more. The world's economies are close to collapse and the gap between the insanely wealthy and the desperately poor grows ever wider. Worst of all, an ages old conspiracy bent on world domination has decided that the time is right to emerge from the shadows and take control. No one believes they exist. No one but you.
Deus Ex... good old CLASSIC Deus Ex is a perfect game. Not perfect in the way that it doesn't have it's (slight) share of bugs and flaws. Compared to modern game titles however, it can be considered bugfree.
No, Deus Ex is perfect in the way, that it offers a really, really, nice experience.
The gameplay is a mix between shooter, stealth and RPG. And YOU decide for yourself, how this mix is balanced in the end. You can basically play the game almost 100% like an ego-shooter or almost 100% like a perfect stealth-game. You can neglect all the RPG elements except for attributing some statpoints or cou can talk to each and every NPC and try to dive deep into the story.
Story is, besides the gameplay, the next BIG point in this game. Deus Ex has a GREAT story and you get easily sucked into it. And that's without 10GB of cinematics. It's really good old-school in this aspect. Story is told by the actors (NPCs) themselves and develops right before your eyes while you play.
Seriously, get this game for a few bucks and just play it. You don't really need any mods. Google for "Kentie's Deus Ex launcher" and "Kentie's Unreal engine renderer" and you should be allright with Deus Ex on modern systems.