arsdigita:
Regardless, it is questionable whether we can actually do it in a meaningful way
Meaningful way...what is that?
You mean a comment that you liked this character or that character when they did this or that? A comment that you thought it was an interesting series and looked forward to the writer continuing the series? You mean a comment that the part of the series made you laugh or cry or feel sorry for someone, or perhaps you recognize parts of yourself in the story?
ANY and ALL comments are meaningful to an author or this site. No author is going to be disappointed if anyone writes a simple comment like those above. If we ever get a real live qualified "critic" on site then perhaps for that one person an author may expect more, for anyone else any type of comment including constructive advice is always appreciated.
Sorry arsdigta, but to me, and perhaps me alone, what you write is simply making excuses for not commenting more. I know you comment some and please continue, but don't rationalize away perhaps the nagging thought in your mind that is telling you to comment more .