Metroid 3 & Bioshock

So I've been playing a lot of both of these lately and it got me thinking about linearity in games. Both are fairly linear stories with a few optional side quests here and there. One thing about Bioshock that gives it more variety though, is the endless stream of weapons and plasmids. I get to decide just how I want to kill the crazy denizens of Rapture. Should I freeze them, put a few bullets in them and watch them shatter (one of my favorites) or set them on fire, or just shoot 'em? An important question, for sure. :) But Metroid just gives me a few options to dispatch foes.
I guess I don't really have any conclusion here, I just thought it was interesting...