Measured opinions are always good to read. I watched Bioshock, and I think what did it for me was the setting and the mood, and the fact that it was dealing with some issues behind the philosophy of the founders of that place. Then there's a big twist with some meta implications, which was pretty cool. You're right, though: to each his own.
Have you tried other games like MUA, like Baldur's Gate Dark Alliance? I've never played MUA, but even though I can get some fun out of Dark Alliance in short doses, it actually sorta wears down on me after a while.