Yes, it's fun, even as a game from 2002.
It's an FPS, puzzle and exploration game inspired by Systemshock, an even older game. Apart from your standard guns, you can use a wide variety of plasmids, gene altering abilities that give you various powers, like being able to use telekinesis, or set things on fire (You rely on plasmids a LOT, since ammo is scarce and generally ineffective)
The whole game takes place in a massive city built in an undersea trench, completely self sustainable and rapidly falling apart.
The city has a 1950s vibe to it, casinos, cafes and an entire metro system.
The man who invisioned the city was Andrew Ryan, who wanted it to be a place free of any ideologies, where science and art would prosper.
This concept worked until 1958, when a mysterious breed of undersea slugs was discovered in the trench. These slugs carried a gene altering substance called ADAM, which was used to make the plasmids. ADAM production was relatively low, and somehow, implanting the slug inside of a little girl's stomach nearly doubled the produced ADAM.
Anyhow, people got addicted to the plasmids quick, and the city quickly spiraled into a civil war.
Now it's 2007, the main character Jack survives a plane crash somewhere in the Atlantic, near a weird lighthouse in the middle of sea.
You now have to find a way back to the surface, while being assisted by the mysterious Atlas, a guy that gives you tips over the radio.
" No Gods or Kings, only man. "
-Andrew Ryan