Deus Ex: The Fall [Steam store page]
This isn't relevant to the rest of the Deus Ex series, and is a trash mobile port with rough graphics and shallow mechanics.

Deus Ex: Human Revolution - Director's Cut [Steam store page]
While the story is weaker than the original, this FPS-RPG still offers many viable playstyles - and a visually stunning world. And the Director's Cut does a slightly better job of integrating the DLC, although they're still sort of an independent experience.

You also get a few other perks like developer commentaries, although these don't have any visual indicators to show where they are, so they're hard to locate and activate as you're playing. The redesigned boss fights are a nice touch though, and definitely a welcome change compared to the originals.

Deus Ex: Invisible War [Steam store page]
Fairly good story for a FPS, but doesn't even compare to the original Deus Ex. The missions give it a much more structured feel, compared to just one general objective in the first game.

The gameplay itself also leaves a bit to be desired. On 'normal' a headshot will kill a standard enemy, yet when you reach the last few levels the armored enemies take three shots from the most powerful gun in the game. Since the game uses a single ammo type for all guns (more powerful guns use more ammo) it is extremely easy to run out. This leaves you with melee weapons and grenades.

The mods your character can install are much more powerful and useful than the original game though, and you can get them maxed out by the middle of the game. Bot Domination + Thermal Masking lets you bypass/control turrets, bots, and cameras with impunity. Health Regeration lets you trade energy for health and win impossible fights.

Lastly, the game allows you to apply two mods to each gun, which results in cool combos like a silenced pistol that can use electromagnetic shots to disable laser tripwires. Very cool

In the end the game is just okay because it isn't balanced nearly as well as the first one. You get tons of money, mods, multitools, and grenades - but not enough ammo and a plethora of hard to kill guards on the last few levels.

Deus Ex: Game of the Year Edition [Steam store page]
One of the best FPS I've ever played - fantastic story and detail. Each play-through you'll find new areas, people, and story that you missed before. Highly recommended