For me, it was positive. When you're going through personal hell, there's a lot to be said for having others in the situation to commiserate with. Do many of the guys there sound like jerks? Sure. Maybe they even are--or maybe they're just blowing off steam in the face of a horrible situation. I think it's often the latter.
One side effect of carefully banning forums that (truly) support men is that we're left with an environment where most places that might seem to be "help" are actually dedicated to gas-lighting and castigating men in this situation. This has created a vacuum where some rather dubious looking options are actually the best available.
May the gods bless my MRAs and the guys at my local dive bar. Without them, I wouldn't have made it.