To suggest that a user whose comments you'd find both ubiquitous and worthless would also be so judged by a moderator "examining the case" seems like folly to me. Do you by extension suggest that people always vote the exact same, too? When you downvote a comment, would you expect everyone else to also downvote that comment, because the downvote would be "obvious"? Why would it be different with a moderator.
Such things are evidently subjective. There is a difference between using your own voting to convey a message, and bringing in some authority figure to "examine the case". All these courses of action are not equal.
I'm sure you can imagine comments that you yourself find interesting, while others find worthless. I myself have written many such comments, little puns in particular. Just imagine a long string of them. There you go.
If a user's history is controversial (both upvoted and downvoted) versus only downvoted, then punishing you for downvoting all (90%+) of their comments (if they have more than a few) is completely justified.
At any rate, here is an extra filter to prevent false positives even further - if you look at the comments where only the offender has downvoted and you see neutral comments (those which would have neither been downvoted nor upvoted normally) there, then you know there is a problem.
Below is a message I just got from jackk. Some specifics have been redacted 1) so that we can discuss general policy rather than the details of this specific case 2) because presumption of innocence, just in case there happens to be an innocuous explanation to this.
So... thoughts? I have mod powers, but when I was granted them I was basically just told to use them to fight spam; there was never any discussion of any other policy, and I don't feel like I have the authority to decide on the suitable course of action without consulting the rest of the community.