Who were the "good guys" and "bad guys" in this film in your opinion?

I think you've nailed it. There really are no good and bad/heroes and villains, just people.

The cannibals were in some ways barbaric savages. Look at how they dealt with that poor woman by violently killing her, putting her own the pole.

But this film is supposed to challenge our world view. It is easy to look at the cannibals and assume use in the 'civilized world' are better, and a step above.

But look at the camera crew. We see during the course of the film that their 'hard-hitting factual' documentaries are set-up, and they are prepared to go as far as killing the cannibals to make the footage look real and make the jungle society look like they were acting in ways which they wouldn't have been unless provoked. They're shown as having no empathy for death, even finding it funny when they found the woman dead on the pole. When not surrounded by polite society, the camera crew are prepared to rape, without remorse. Amongst many other atrocities. At least the cannibals stayed within the rules/laws of their society, as evil and wrong as those rules are. The camera crew were prepared to break the laws, no matter who it armed, without a hint of remorse.

There's no good and bad in this film, it's more meant to show that just because the majority of people are from what is considered civilized society, it doesn't mean that they're better than these supposedly lawless savages.

They were both evil. The semi-remake Green Inferno was satisfying since the sadistic cannibals end up getting gunned down by mercenaries.

I would agree that there were no real heroes or villains in the film.

Personally, I think the rescue crew was the best out of everyone (mainly the anthropology professor, who seemed to be the only non-native with any empathy).

The native tribe (who weren't necessarily cannibals, if I recall correctly; I think it was said that they only do it occasionally as a special ritual) were the good guys, in that they were brutally victimized by the camera crew savages and only retaliated as anyone understandably would.
But I'm not condoning the raping they did at the beginning. However, clearly their culture is different, and apparently it's a normal thing for them to bury babies and club the mom to death, so it's hard to really judge the morality of all of that stuff from such a different perspective.

Lastly, I think the original camera crew were the only savages in that rainforest. They brutally raped, tortured, and murdered the native people just for pure enjoyment. They saw them as subhuman, and they took sadistic pleasure in burning men, women, and children alive just for kicks.
Well, for monetary profit as well as kicks, because they were going to edit the film to make it look like the other tribe had done these things and these guys are just the beloved camera crew drawing attention to the horrors for the benefit of mankind.

The camera crew were absolute monsters, and I only wish that they'd been put through worse.