While Dead Space is a great game, I found the loading times ridiculous (and I have a good PC), plus I've had a few crashes and once I got stuck in an armor upgrade station. The 3D HUD, and lack of any "fixed" 2D HUD was very immersive, however.I'll start us off with Dead Space, which I thought was almost perfect in every mechanic. The shooting, movement, visuals, frame rates and sound all worked perfectly to immerse the player, barring one or two horrid on rails turret sections.
I think Mirrors Edge wins my vote, as the only issue I ever had was ONE crash on startup. Considering how much I play it, this is quite decent.