I loved number 4, I loved how it kept changing locations and kept lamenting the burden of warfare before showing awesome scenes of Snake beating the shit out robots and cyborgs having swordfight sex with a vampire. I really have no idea how that could possibly be Raiden though given the condition he was left in at the end of 4.
And Metal Gear Solid 2 is awesome in its utter bizarreness. Women who can deflect bullets, the President of the United States rebelling against a bunch of evil dead computers, Ocelot getting possessed and turning all British, Vamp's ridiculous origin story.