Dunno about best game ever, but it would probably rank in my top 10. Deus Ex was outta this world when it came out, and luckily for me, my friend had a power house of a computer and could run it pretty much flawlessly with the graphics on max.
Amazing game, beat it a few times. A lot of fun.
Best games for me would also include Goldeneye and Half-Life.
Hey, you scratched my anchor!