Fingerprint scanning less secure than a PIN?
Let me explain...
You're at a party, had a shandy or two too many and have nodded off into a gentle slumber.
Your mates, being mates, decide that this is the perfect opportunity to shave your eyebrows off, draw a penis on your forehead, take a photo with your phone and send to all your contacts.
With a PIN, or unlock pattern, they're stuck. Can't get in. Fingerprint scanner? Perfect... try each finger until it unlocks... Bob's your uncle.
Seems to me that the very time you need security, when you're drunk or just asleep, is exactly when this technology becomes a serious failure.
Fingerprint scanning... insecure by design.