Camera angles at its best. There is no need to control the camera angle if it's already position in the best possible matter – which seems to be how the camera works all the time. This is perfection at work.
The one drawback in my opinion would be the replay value, as many people would find it pointless to replay the entire game just for a few secrets, since the story is the main reason to play a game like this.
Though the shortness of a game may sound like a flaw, it’s really not. In ICO’s case, a longer length would have made the game quite tiresome as puzzle solving & pulling the girl from he pits of hell could tend to get a bit repetitive.