Works the way I expected it to. I only have problems if my fingers are wet. That said, fingerprint aren't all the same from person to person in terms of readability. It's also certainly possible that something's up with your fingerprint scanner or even the way you registered your fingerprint.My hands are not greasy, my 5s is perfectly clean and still it doesn't really 'just work' the way you'd expect it to. You seem to have to do it at the right angle every time if you want it to actually work properly, align your finger 20* to the left or right and it'll just say 'try again'.
Be careful using "you" where you should use "I".