For a game that came out in 2011 I found Deus Ex to be really good. I do aim to play for achievements and this is a game you can get all 1000g in one playthrough. The stealth mechanics of the game are easy and flow well and give you a totally different side to the game that using guns and killing would not show. The story is pretty good, but I felt the ending could have been done a little differently although how you play can effect that. I am not familiar with the other titles in the series which some googling helped fill in the blanks for some of the back story to the game. Not knowing anything otherwise I really like the world and idea of Deus Ex. I would greatly recommend this game. Maybe we will see another installment, but who knows.
The DLC was okay, not very long, but it helped fill in a part of the story that will make itself apparent if you buy it, which is not at all needed to play the game from start to finish.