The Mass Effect trilogy is an action RPG third-person shooter developed by BioWare.
The gameplay is a mix of action role playing and third person shooting that takes advantage of AI team based combat. There is also large universe to explore that features many characters where interaction contains choice based branching dialogue.
Pro Choose your own adventure
The player is required to make many choices over the course of the three games, all of which have far-reaching consequences. Not just friends, but entire species can live or die based on player decisions. Morality is also not prescribed - the player is free to make Shepard be who they want them to be.