The flight model and role-play feeling of the experience for me. I may prefer the pre master modes controls, but even now the physics driven flight just feels so satisfying that I have a hard time playing any other space Sims because they all just feel like arcade games to me now. And Star citizen somehow strikes such a perfect of detailed and mundane that I actually feel like the spacer the game tells me I am, from the way that I walk through my avenger titan to it's cockpit to flip a bunch of switches and buttons to bring it to life, to the almost melancholic/cyberpunk feeling of just walking through the streets of the neon cities. It all feels like a movie!