I think civil is a bit subjective. I had truly thought I wasn't writing any flames or anything inappropriate so this blindsided me a bit when it all came to a head. I really had to look back on them and see where I went wrong to fully get it. While they're were borderline, someone could see them as being too critical or felt like I subtly implied something because I hadn't said anything encouraging or positive along with them to balance things out. A well-rounded comments is probably best at all times, but only if the author is receptive to them. That a way even those authors who are fine with getting only concrit would also get something nice to show them their readers appreciate them. At least this is what I came up with after thinking about it for the last two days.