1. Mass Effect 2
The magnum opus of BioWare's action role-playing trilogy.
With great story this moralist tale unfolds between planetary battles so if you've been living under a rock or avoiding the hype over the series, start with this great title and work your way to the others. Routinely called one of, if not the, greatest video game ever made, it doesn't disappoint. The controller will be glued to your hands for hours on end.