Talk to people who work in the industry, read reports both pro and con, and form your own opinion based on your own values and/or dietary concerns.
I don't bother getting worked up over obvious propaganda, it comes from both sides of the debate and is easy to spot. What is more troubling to me are biased studies...that ALSO come from both sides.
These farms operate on a curve as far as how responsible they are to health and environmental concerns. There are some that are very good and actually care about the product they are putting out and the damage they do to the environment, there are some that obviously don't. There are some that will fight change tooth and nail, there are some that will try to innovate.
I am really hoping that the open water/closed containment system being installed by Agrimarine is a success... if viable it may force some changes that could change the industry for the better. It may however also put some of the smaller outfits that are probably operating pretty good shows right now out of business, which would suck. Startup costs on the closed containment facilities are really high.