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Salo is definitely an easier watch than Cannibal Holocaust. Of course, part of this is because it doesn't contain any unstimulated violence, but I mainly find the film more depressing than disturbing. Instead of having the characters desperately try to resist the violence, they passively accept it as it goes on and rarely ever fight back. Given this, the film feels emotionally muted to the point I could understand someone calling it boring. It's still not an easy watch (it wasn't as messed up as I thought it would be going into it though), but it's definitely worth watching if one's up for it.
With that being said though, I wasn't the biggest fan of it as the film made it clear what it was criticizing early on and then proceeded to restate this one-dimensional theme over and over again for the remainder of the runtime. I'm down for a rewatch at some point to give it another shot though.