Interaction

I, personally, do not consider this a major point - but it deserves a mention none the less.

A game, is called so because it allows players to control what is happening. This is the difference between games and movies.
Which is why cut scenes are often unpopular. I myself often enjoy cutscenes, what I do not enjoy is being forced to watch them.
For example, if I have already completed a game - I might decide to try it again on hard mode. When I do this, I expect to be able to skip dialoug I've already read, I do not want to have to read through loads of text when I know the story already.

So as I said before: Keep cutscenes, but to a minimum!