This may be because there are more comments on each submission so your comment may be glanced over instead of being read properly like it would be if there were only a few comments on something.<p>The comment system is usually very good but for things like the Google/China post it is very hard to come back a few hours later and see what's new because of how things are ordered, I'm sure there would have been a lot of valid points in that thread which didn't get upvotes.