I finished the original Bioshock for only the second time yesterday, this time on hard saving every Little Sister. It had been about 4 years since I last played it and I'd forgotten large parts of it, mainly just how great it really is. I'm sure I don't need to bother explaining why it's so great but for me, the atmosphere was the best part. My only problems were the large amounts of Pipemania involved and the stupidly easy final boss.
Here's hoping Bioshock Infinite can turn it up to 11!
XBL/ PSN/ Steam/ NNID - MatMan562