This is why I will point out issues in code only on the form of stating potential improvements as best as I can. I especially try to avoid hating on the author - it might have been me or the boss who's standing nearby...

In fact, I often conciously refrain from using blame on an "interesting" piece of code because it doesn't matter who wrote it. Looking it up would just satisfy idle curiosity, but yield noninsight into how to improve the code. In fact, I think that blame should just list the commits, but hide the authors by default. "What changed? " and "how?" are always much more pressing questions than "who?".