Get the whole trilogy in a single pack. Great RPG, heavy on the shooter element.
On this game, you can: Save the universe. Dance awkwardly in night clubs. Date your ship mates, homosexual and interspecies relations are fine too.
10/10 Best dating sim ever on the citadel (IGN)
8/10 Shepard. (Wrex)
9/10 This one is worth buying (Hanar Gamer)
Just don't buy any DLC and it's an unbeatable deal.