Simply its bioshock that changed the environment your in but possible explanations using tears as to why a few things existed(vigors) or even how possibly rapture came to be. I think of Dewitt telling his grandson(ryan) ... visions of a city away from it all.
From 2 to infinite.....
pros: Dont have to hack every dang machine I see to save a couple bucks..... big daddies are fun, but even that after time became a, oh ya gotta take them down again thing, well on constant replays it adds up..... In bio 1 and 2 I can carry all these weapons yet my wallet can't hold more than 500, thanks for fixing that... play through, although i wish was longer it is an easy one to restart again right away and jam through it again.. try some different combos but even that is limited..gear effect can add up and some very cool
cons: Miss the creepiness, splicers crawling around and never quite knowing where they will drop ... Big daddies/big sisters(somthn close) ... ya maybe not have to clear 3 every area but a few here and there to either attack or even avoid for fun would be nice.... combat system, I dont mind stuck with two weapons since always something around to exchange with, first play i used shotgun/carbine 90% with sniper when needed... though second play through mixing up vigors and added volleygun found it even easier, I miss readying up an area with traps, mines and such for more unique killing styles... gear, seemed random but one play through never found the piece I wanted and 3 times in a row during same play through found exact same piece, need to get rid of duplicates dropping....mobs to much the same thing, just more here and there
All in all a great purchase.... story was to me ingenious, future leaves room for imagination if add in how rapture fits in.... now combine infinte and bio 2 with maybe land/sea/air... or go future to a space station!! And that would be sweet.... I look forward to replaying again and for the next BIOSHOCK in line..... thanks