I very rarely vote against any content on both hive and Listnerds. For two main reasons.
The first and most important is to respect the effort that everyone makes in their publications even if they are not to my liking.
The second is not to create a bad environment, when someone is voted negatively, for whatever reason, a negative environment is created in which the votes are no longer made for a real and impartial reason but for many other reasons. This creates mistrust and mistrust destroys communities.
On the other hand...If people are being rewarded for just cruising along without putting in a ton of effort, that can destroy a community as well. We do need a healthy mix.