JobVent takes commentary and rating information from former and current company employees. Anybody may post anything about any company.
Based upon the reviews, most people, when given the venue and format, will complain rather than praise. So JobVent is what it says; a place for employees to vent about their place of work.
Also, most of the companies I saw reviewed were large. And the complaints are about large company problems - pay, benefits, work environment and "respect" - all directed at "management" primarily.
JobVent exists because a lot of people don't like what they have to do for a living. And dissatisfaction often finds a soulmate or two or a hundred.
Sites like JobVent popup frequently, and if they collect enough opt-in email addresses, will have a huge mailing list of dissatisfied recipients to market to.
I wonder if employers read these sites (I am sure they do). I also wonder if it really matters.
Lesson learned: Those who are posting are fighting with the only option they think they have.
You know better. If unhappy, LEAVE. And using Web 2.0 technology, more and more employers will know where to find you.