I just finished BS2 after playing 20 hours of it...then putting it away for a long time. I just finished it playing the last couple of levels.
I don't get why ppl say it's so bad. Is it more or less....more of the same? Sure....but thats not really a bad thing. Was the story not as good? Sure....but then again it's the gameplay that makes both Bioshock 1/2 so fun.
I really don't see the "OMGZ, BS2 IS ABOMINATION WTFBBQ!!!!" as very reasonable.