Deus Ex Human Revolution is a good game with a couple of questionable design choices.
Choice plays a big role in Deus Ex Human Revolution, you get to choose how you approach every situation, but thanks to the dumb AI, the stealthy approach is the only fun way to go. If you engage enemies or get spotted, they will usually just gather and stand in one spot near your cover, but will never come close and try to assault you, but if they do you can always take them out with a single button press. Since you can line up headshots without even the need to jump out of cover, the gunplay quickly becomes both easy and boring.
Thankfully if you really want at least some kind of challenge, you can complete the whole game without ever being spotted at all. Plotting the best route, knocking out lone guards from behind and jumping from cover to cover at precise moments is truly fun. For some reason, the bosses can only be beaten by blasting them with weapons, which really limit your options, freedom of choice, and feel shallow or forced when compared to the rest of the game. Being stealthy also earns you more experience and rewards, so that's the way the game is actually meant to be played, but if you just want to quickly rush through you can also do that but wont really get any benefit apart from saving a bit of time.
Aside from the main story mission, it is also possible to find secondary missions, but there are only a couple of them and most can be easily missed if you don't explore everywhere and talk to everyone you happen to pass by. These secondary missions usually have multiple different conclusions depending on your choices which can determine your reward.
The augmentations are the key feature for both gameplay and story, by using certain points you can choose from a variety of upgrades and customize your abilities that best suit your play style. Sadly most of these augmentations upgrades are completely unbalanced, for example some are completely useless while others can get you out of almost any situation.
Hacking is presented in a form of a little mini game, where you take over nodes or retrieve valuable information that give you money or experience. It's very useful overall, and at first it's pretty fun, but later on there is simply too much hacking going on that it becomes more of a hassle, especially since it's pretty much random at times. Most of the computers you can hack contain only an email or two, which is usually just some flavor text but can rarely reveal a password, but some computers are security hubs which can disable cameras or turn robots against enemies.
The controls feel upside-down and will take a bit of getting used to, especially when it comes to peeking out of cover. There is no doubt you will have a good time with Deus Ex Human Revolution, but in the end it does have it's flaws which stick out like sore thumbs because of the so many highs and a couple of awkward lows.