Mass Effect 2

[Weedguru_Falkon]

It's a little old now, but it's one of the best orchestrated games ever made. Extremely in depth, what you do will influence the game in many ways.
I wasn't able to beat the first one due to some bastardly glitch, but I know you're supposed to be able to integrate the choices you made in the first into the second, and when the 3rd one comes out, everything you've done in the first two will affect what happens in that game.
Talk about deep! The story is phenominal, graphics are great, gameplay is fun...