Bioshock is somehow different. The setting is fun, the weapons are not usually (I say only "hand"), the story can engage well, ultimately it is just right for BS.
Why only 4 stars? Na 5 is perfect and this is not BS.
The graph does not convince me completely (ok is the game of 2007) and I would have liked a few more different opponents. Since it falls short a bit of variety.
But what can I complain about long? Off to Rapture, by loading and off you go!