well... i played the PC version... and can I say whilst i thought the original game was ok but a bit limite dinsomuchas it was a bit repetitive, a bit hard, the sequel was all this but way way more!
Huge story, massive time to finish the story, a multiplayer worth a few evenings, I loved BS2 and would recommend it to anyone - especially at a tenner!!! I think i got 14-18 hrs single player delight from the main story, with far more diversities than BS1 - a quality story... go for it!