I was playing this game literally for less than a half hour and i started feeling like i was really in the game, almost to a literal sense, feeling the weight of my hefty AR, near falling over after taking a blast from a fallen devil walker, leaning around corners, and i realized what was happening and had to take a quick break to let the feelings subside. No joke. I'm impressed and also very addicted. Thank you Bungie, i think you managed to one up HALO, and that's saying something. I Haven't even played the full game!