Ex, a respectable amount of evidence exists to the contrary. Lives have been saved by Tamiflu recently, after exposure, infection, and influenza symptomatology (H5N1). Spend some time on the influenza forums and you will see. Many people, including "professionals" have been mistaking antibiotic-type genetic resistance for the H5N1 situation, where resistance is seen due to the incredibly prolific replication ability of the virus. In other words, it overwhelms a normal dose and course of Tamiflu. Better results have been seen with a double or triple dose, for twice the time of the normal course. Hence my PM question about probenecid, which increases the level and duration of Tamiflu in the body.
I'm not about to bet my family's lives solely on Tamiflu, but one of the best anti-virals out there definitely seems like a good start, even if imperfect. Comments welcomed.