I differ on some points with the original poster, but in general I'd have to agree that it sucks.
Now before the death threats start coming in, let me just say that it's not a crime to not like the game! I mean, I didn't like the first Spiderman movie much either, but that doesn't mean I should be thrown under a truck.
I'm not interesting in telling you in detail why I though the game was pretty crappy. If you care, I've written my reasons here:
MGS4 Sucks: DO NOT BUY THIS TERRIBLE GAME
Yes, I wrote a blog about it! Only because MGS is such a phenomenon, and I was highly anticipating this sequel, and I was so disappointed -- my only blog was the only forum where I could write my opinion without getting totally shut down by everyone who looooooooves the game. I don't have a prob with the people who love it, just know that I think MGS4 sucks.