EDIT: First I have to say that I loved Yahtzee's review, but it's almost a non-review! The rants about the story were spot on, but the part about the gameplay is so wrong I feel like we weren't even playing the same game. Here's my take on it:
Anybody who is going into MGS4 cold may as well just skip all the cutscenes. My girlfriend played it, and although she had no idea of what was going on, she enjoyed the gameplay. It caters to many different kinds of people, and gave me the impression of Resident Evil 4 meets Thief when I first played it. Of course, you could take the FPS approach and always be in First-Person mode when shooting a gun, or use Auto-Aim if you suck.
You could also play it the way Metal Gear is meant to be played, and if so, I don't see how Yahtzee can just make it by with only the Mk 2 tranquilizer gun. To pull off a no alert game you really need to make use of the Mk 2, a cloaked Mk II (Otacon's robot), the Mosin-Nagant, Smoke grenades (of all colors), Stun grenades, and magazines (unless you are Yahtzee, because he's uber).
Not only can you play the game in your preferred style, you can also take several routes through the same area. For example, there's an area where you can either help the rebel soldiers escort an armored vehicle to bring down a barricade, or you can hop the rooftops to go around the barricaded area.
Also not mentioned in the review is that the Drebin Points system really appeals to people who like to collect items or unlock new stuff. Your points roll over into the next game and you can keep playing/farming for new equipment; just the the light-RPG elements incorporated by games like COD4 or R6V2 (as a side note, Kojima must really like COD4 as the best guns - the M4 and P90 - are acquired quite early in MGS4).
It's unfortunate that many peoples' first taste of MGS4 is lengthy cutscenes that just make no sense whatsoever (I played the last 3 MGS games, and a lot of it *still* didn't make sense). It stops them from enjoying the game, and seeing little details (see below) that the developers added in that make it so great.
(Try holding up a male soldier and doing a full body search; at the end of the search, Snake will grab the soldier's groin and make him pass out from the pain. Then hold up a female soldier, do the same thing, and see what happens...)