I've found that the people who say Modafinil does nothing for them are people experienced with high powered stimulants who are expecting the same kick. This is mostly due to a misunderstanding of what the drug actually does.

Modafinil is a "wakefulness" drug. My favorite comparison is the feeling that you get when you have to pee in the middle of the night, and your body sends out that hormone to wake you up. Modfanil just kind of keeps that process going continuously. There is no "high" or any hyperactivity, just an extra layer of wakefulness.