Dan isn't a bad guy, I can almost guarantee you. Tenants can be difficult to deal with, and there's just a certain status quo in the industry that everyone has come to accept. I'm just saying that there's a better way, and things like RentPost.com and RentMonitor.com are a step in the right direction.
Congratulations. Calling someone a slumlord just because they own property and are willing to discuss their business online does not give you the right to slander them.