This movie is awesome. It beats many popular movies. Here is why:

Seriously, I'm not surprised, again, this awesome movie, has a low IMDb score, while other movies with "famous" actors have very high scores. I'll be specific, unlike those people who criticize this movie in general terms, saying: "It's low budget", "It was shot partly in the United States", "The actors were really much older", "They did not act very well", and more bul...it.
First, all actors, I believe did an amazing job. The skinny cannibal with bad teeth, played a very good role turning personalities from being friendly, to being a prick, to being a murderer. All 3 guys did not play the typical US teenage jerks in movies. In fact, all 3 seemed to be charismatic so you do feel sympathy for all 3. I liked everyone in the movie. If it were the "typical" US -story -line, 1 of the 3 guys would have been the typical-token black guy and would have played an obnoxious role. Or 1 of the 3 would have been a girl giving the 2 guys the bitch-attitude. There was none of that.
Second, the movie was extremelly entertaining. The cannibal using the same tape to hold them captive was very clever. The flashbacks used in the movie, were really well executed. The guy emptying his whole gun onto the dude was unexpected and kind of funny. It made the movie better and not any less, at least for me.
Third, I'll be partial here: The movie, at times, had one of those 1970s-1980s grindhouse, gore vibe. Sometimes, I think,it would have been better if they had done it in a "scratchy" way like they did with "Planet Terror."
Fourth, the movie, used little or no computer generated graphics; little or no movie stage-sets were used. Fifth, the story is more believable than all those "famous" Fast and Furious movies where cars fly and suffer no scratch.
If you think they acted badly, look instead to Clint Eastwood, Bruce Willis and other famous ones.
I'll just stick to Clint Eastwood: This idiot always has his same standard, stiff-rigid face. He never smiles, only an occasional dumb-forced smirk; same body posture, same accent, same tone of voice, same eye-twitch in almost every single movie. The same can be partly said about Bruce Willis and other "famous" actors. These are the bad actors.
10/10