What I liked:
-The music and the soundtrack
-Some of the voice-acting
-The early game's art deco aesthetic (before it gets dull and monotonous)
-The idea of the plasmids and their theoretical gameplay appliances (and not their actual execution, which boils down to what made Skyrim's magic suck ass)
-The plasmid hand animations
-The underwater view of Rapture

What I did not like:
-Most of the voice-acting, especially that of clearly non-English speakers, who are clearly voiced by fluent English speakers and forced to put on exaggerated and ridiculous accents that make the voice acting almost laughable
-How the game dangles this gorgeous view of an underwater city while railroading you to undifferentiated hallways that are functionally the same and offer zero interesting visuals past the one-hour mark
-Bioshock's insistence on telling the bulk of its story through audio logs, which feature the aforementioned laughable voice-acting, but also make little to no narrative sense (why are so many people recording their thoughts out loud?? especially in what is obviously not their native tongue?? oh it's just for exposition? gotcha.)
-the way none of the guns or plasmids feel good, even for 2007 standards
-the way plasmids stop having useful gameplay applications past the one-hour mark
-the way the big daddies attack
-the stupid "gotcha!" plot twists
-the way most of what you're doing is just going from one end of the map to obtain an object, to another end of the map to obtain the second part of said object (because obviously)
-the map screen, which is genuinely one of the worst implementations of a map I have ever seen in a game maybe ever, even A Link to the Past got 3D maps right and that was in the '90s
-the implied queerness of Sander Cohen, which is so ridiculously unexplored that the inclusion of multiple mentions of his romantic interest in other men makes me think the writers were just too scared to make it overt
-this quote from one of the developers
"We also tried to hint at, without getting pornographic, Cohen’s conflict with his own sexuality. But people read that much dirtier than we intended. Go figure!"

This seems very overrated... I don't get it
I'm guessing it's one of those games people love due to the nostalgia of playing it when it came out. Not discrediting how ahead of its time it is for 2007, it is refreshing for a game to have this aesthetic when every shooter in the 2000s looked so ugly with the brown filter. The art direction is really good and probably the strongest aspect for me.
However, as good as the atmosphere is I can't get over how the story is told through hundreds of voice memos you find that are hard to pay attention to while you're shooting. It makes it really hard to connect and be invested in it. People praise bioshock's story so much and then... that's it?
The gameplay is clunky and for me it wasn't that much fun. Maybe I'm spoiled by today's standards but it just didn't click, even with all the different plasmids it's still very basic and it just got very repetitive.
And lastly, what made me quit is that technically it's a mess. I tried installing all the patches, tweaking the settings and everything but it's a mess. I managed to stop it crashing randomly mid gameplay but it still crashes constantly just by opening the map or saving the game. And you do have to save constantly cause you never know when it might crash again and make you lose progress. It just got too frustrating and I felt like I was making too much of an effort for an experience that wasn't that rewarding.

Classics are classics for a reason.

I've played the original Bioshock back in 2012. It was one of the games that reignited my love for video games after a couple of disheartening years. When I was a kid, I basically only played Nintendo, which was an amazing way of growing up but when I reached my teens I kind of lost my interest in videogames. I thought I had seen it all.
Then we managed to upgrade our family PC to a gaming rig for the first time ever and it was as if a whole new world was unfolding before my eyes. I played, among other things, Limbo, Braid, Bastion, Batman Arkham City, the Mass Effect trilogy and, of course, Bioshock.

Let me get this out of the way: I didn't get it.
I fumbled with the keyboard controls. I was never paying attention during the cinematics. I couldn't understand the oldschool lingo, especially when it played in audiologs at the same time as I was fighting for my life against a horde of splicers. It was so different from everything I had played until then. It presented such a novel way to tell a story. God, I didn't get it all. And I loved every little bit of my ignorance.

Twelve years later and with a lot more experience under my belt, Bioshock doesn't surprise me anymore. The gaming industry changed. I've changed. Nonetheless, despite featuring some visible expression lines and greying hair, it's clear that Bioshock aged pretty well, both as a solid immersive sim/shooter and as an interesting storyteller.
I feel lucky for getting to play it back then. It was an eye opener; one of the pieces that made me look at interactive medium with new eyes, and to which I own a whole lot of my appreciation for games today.