It was quite preachy at times, and presented damn near everything in the movie as fact while failing to show any supporting information.

I don't remember the exact year it was made, but some of what it discusses has been brought into question as well. Specifically the ecoli and corn fed cattle argument. If I remember correctly there was a study that essentially disproved their claims that grass fed beef is any more safe than corn fed beef (depending on when the movie was made they can't be faulted for this, I believe that the studies calling this into question were done after the movie was made).

Anyways, I thought it was pretty well made, and there were some pretty interesting topics brought up, but I also thought it was shockingly devoid of real facts. They presented everything as fact, but did so by having people talk about so much of it as fact. That really bothered me, it was almost as if they either thought their watchers weren't smart enough to question what they're saying, or that they didn't have anything to back up their claims.

Seeing inside the slaughter houses, the chicken coops, and the stuff about the fillers in burgers was pretty....nauseating though.

For food documentaries I preferred The Future of Food. The whole Monsanto mess was covered very heavily in that one...it was pretty damn excellent.