Easily one of my favorite games ever...it has some issues, but Im one to look past issues in games in general and just enjoy the good over the bad
The art and story were incredibly unique and skillfully done.... I thought, outside of missing the set up and trap gameplay from BS1, the gameplay was vastly improved over Bioshock 1. A unique environment that easily rivaled Rapture, a unique story that was well told, and gameplay that was above most shooters with the added mobility.
I think people in general let the expectations of what they had for the game get out of hand (no help from early gameplay footage) and instead of seeing a great game they see one that didnt meet their expectations and is therefore it was terrible