A superb game! A step forward in the direction of "Games as Art".
I would like to start off by saying this game has the best story out of ANY video game. EVER. Hands down, no holds barred, it is THE best.
Humanity has just unearthed alien ruins on Mars which has in turn given them sufficient technology for Faster Than Light Travel. Upon expanding out of our solar system, we discover a massive space station dubbed "The Citadel". Inside this beast is the Citadel Council and its respective embassies. The purpose of this council (composed of Salarians, Asari, and Turians) is to make decisions that will best advance the state of Citadel Space, with each of the species lower on the political food chain using their embassies to try and advance the state of their systems as well. With the Council being watched so closely and having tense political associations with species in the Verge (an area where species who refuse to acknowledge the Council's authority reside) it cannot always take action on the record. Thus they have a shadow ops group know as the Specters that do their dirty work.
As it turns out, one of them has gone rouge and is attempting to wipe out humanity. He sees them as developing to fast, and becoming the Council's pet; a view shared by many species. Unfortunately, hos treachery is not just to us but to the entire galaxy... I'll leave it at that so not to spoil anything. Naturally it is your job to stop him when you become the first human Specter. That means that you operate outside the law, which is why I marked the social behavior area.
There are times when you have to make hard decisions. Do you shoot a slave trader in the head? Allow and entire species to die out? It can be very difficult at times which is a testament to the developers- you actually care about the characters and the people you encounter.
On a separate note, the graphics are amazing and the tactical, squad based combat is intense, but nothing overtly violent or bloody. The voice acting is also top notch and the ability to travel the galaxy in you ship is great as well.
But for some of you there may be a large turnoff. The dreaded sex scene. While not horribly raunchy, you do see a side shot of your character creeping up seductively to another person in bed and sex is implied. Your character also says something along the lines of "I need more of that" after it is done. Fortunately you are buzzed over the com by your pilot. Fortunately, this scene is entirely avoidable if you so wish.
Lastly, there is some minor language but nothing to write home about. A b---h here or d--n there. Nothing bad.
All in all this is the best game to be released this year and a MUST buy.