It's not though. If you're not arguing a pro-groupthink position you'll get down voted regardless of the quality of your commentary. See just about any politics related thread for an example of that.
Note that only applies to subjective topics. If you're commenting about a purely technical topic then the voting system does seem to work more effectively.
Note that only applies to subjective topics. If you're commenting about a purely technical topic then the voting system does seem to work more effectively.