

you have a health bar and health pickups instead of the screen being covered in blood for a few seconds until you stop getting shot at,

Jack fires from the hip instead of having to look down the sights to hit anything further than a shotgun's range away (although the crossbow does have a scope), the enemy variety is greater than an army dude who yells in Arabic and an army dude who yells in Russian with a slightly different gun, the levels are large and sprawling instead of cramped and linear (they're still kinda linear but it feels more open to me), Namely, its GAME design is most like an old-style FPS such as Doom: What I most like about Bioshock are the places where it differs in gameplay from most first person shooters these days.
