Ask yourself this question: do you like `slasher' films? If the answer is yes, then you probably enjoy daft youngsters getting stalked by killers, women running around in very little clothes, blood and gore and, of course, the most virtuous of the group surviving. Therefore, you will also probably like Paradise Lost, as it ticks all those boxes.
There's nothing new here - a group of annoyingly fit backpackers goes to Brazil, only to stumble into somewhere they really wish they hadn't. I won't go into detail about what exactly the `nasties' want from them, but it's no advert for the Brazilian tourist board.
Saying the film is just `average' would be a little unfair. It's definitely better than the vast majority of B-movie, cash-in, slasher films, but it's no masterpiece. Basically, if you enjoy the genre, you should enjoy this one.