You say you like the Science Fiction setting? I recommend Bio Shock!! It's a first person shooter in it's own right. I remember I refused to play it because I was always afraid it looked like those creepy games that would keep me up at night! But it actually has an awesome storyline. At actually, at times it does get kinda creepy! XD But it's good! ;)

Let me know what you think of MGS2! I love that series but part 2 confused me a bit.