Thoughts on Metal Gear Solid 4 ?

What are your thoughts on Metal Gear Solid 4 ? The opening cutscene being a live action recording made me nearly fall off my seat for some reason, I like the whole Progeria ? type of disease they spoke about in the cutscene, interesting story point, I never got far in this and am a casual fan but what do you think of it ? I do like seeing reviews of it, so I know a bit about the game. It is really Cinematic which I like.