Amateur night . . . I don't know if Roth was leaning more toward horror or more toward humor. In the end it doesn't matter, because Cabin Fever botches both elements.
I'ts obvious that he has incorporated many movie plots and scenarios into his (Evil Dead, Texas Chainsaw, Friday 13th, Pulp Fiction, etc.) which ultimately robs the movie of any individual voice that it would need to succeed. It's alright to pay homage to some of the greats, but one also needs to stand on his/her own without COPYING VERBATIM its predecessors. But mostly, when it comes down to it, the predecessors were thousands of times better, in terms of execution, style and story, than this wannabe.
Summation: Embarrassing 'humor', been-there-done-that feeling, no suspense, many head scratching Huh?! moments, an absolute poor attempt at film-making.