Well you could move around with the Mark 2 on those briefings xD
What I was refering to is that whenever something awesome happend, the cutscene blended and made you play it afterwards like eg. bike scene, rex, rex vs ray, microwave, ocelot vs snake, ontop of derbins ride and so on. MGS3 only had the shagohod battle and Volgin was such a bad villain in my opinion.
I wouldn't call those "playing the cutscenes" at all. Only one that would possibly count was the bike scene against the Ravens, which was pretty much the Shagohod all over again. Nothing really new. What you pointed out were just fights or bosses that happened after they were introduced by long cutscenes that you were able to do nothing through.
The only instances where cutscenes were playable was the mission briefings. Even then you don't really control the characters. The game simply gave you something to do (like finding another battery, and looking at different angles of the area from a little robot) while the actual cutscene took place (and forever, at that) and you had no way to influence it what so ever.
4 ≈ One