Well, if someone leaves a gibberish as a rating comment, it says a lot. Gibberish with one star rating means that rating was posted by an impatient person not playing for story, but for purple epic gear he or she can't find in coh. And probably asks people where are the raids here coming straight from grinder centric mmo's.
As for removing the rating system entirely...What would that achieve? As it stands now, it's next to useless (other than dev approval seal that does seem to warrant some quality). Removing rating won't change a thing, since again, no one would have any idea what stories are good and what are not good. I'll try to give it some thought and put a post up later if I come with any viable ideas.
P.S.
As for compulsory comments while rating: the assumption I made here is that rating an arc is *not* mandatory. And only when you do want to rate it you need to put couple words about stuff. So, there shouldn't be a problem with people spamming comment section just to close the rating window.