It varies highly for me, mostly on length. I think there should be a good balance between cutscene length and providing me with backstory, and allowing me to beat things in the face with my +10 sword of disintegration. Xenosaga did not know how to do this, and was one of the reasons I abandoned the series early on into the second one. A skip cutscene function is nice, but I've only used it if I had to redo a boss, like Final Fantasy X- you know, that boss, on the mountain.