I really think they are (excluding the 3rd). I've always found the Saw movies way over-the-top (and not in a good way). I'd even say the best Saw movies aren't as good as the first 2 Hostels.
The thing that makes Hostel better is it seems much more grounded in reality and the idea that the average family man could also be a sadistic killer who pays to torture and kill people for a thrill is way creepier than some old man who kills based on a twisted sense of justice.
I also feel that the idea of an organization that kidnaps and sells people for torture is beyond fucked up, but also believable, which makes it even creepier.
I really think the first 2 Hostels are highly under-rated horror films that get wrongly branded as nothing more than "torture porn" or a Saw rip-off.
So what do you guys think? Am I the only one of this opinion?