This is my favorite Bioshock game because of how fun it's to play. There are multiple, unlockable melee attacks, plasmid upgrades matter, you have to pick and choose weapon upgrades and passive tonics all go in the same slots so it's possible to specialize, unlike the first entry.
The story is also very good, the focus on collectivism is a good foil to the last entry and the moral choices this time around are less white and black which is a welcome change because murdering children is too on the nose to allow for any nuance.
On a different note, I'm a sucker for the soundtrack. It's mostly licensed music from the era and I love it. It's even used in diegetic ways I wasn't expecting when I first played the game.
Sadly, this remaster is not free from technical problems in PC, but neither was the original release. Thankfully, these days it's easier to find fixes online thanks to the Steam forums and the PCGamingWiki.
To conclude, Bioshock 2 doesn't reinvent the wheel, but it expands the universe in interesting ways and improves on the gameplay in pretty much every single way.