Cabin Fever - Above average horror because it lets the audience underestimate its originality. It's buildup, characters, and setting are intentionally cliched. They look like your typically slasher or Evil Dead-style infection, but the role of the monster is replaced by something I don't think I've seen before, and I'm not talking about the infection. Cabin Fever's virus may be deadly, but it's the selfish, stupid, "me first" attitudes of the characters that really got people killed.
I give it a B.