MGS1-4 are all very cutscene-heavy. If I remember right - yes, the final cutscene for 4 is around an hour long. I remember being late to work and almost getting fired because of that…
MGSV is far more focused on gameplay at the expense of story, therefore it’s not nearly as cutscene-heavy. Personally, I was not happy about that, but the gameplay is far and away the best of the series, so YMMV.