Researchers Created Fake 'Master' Fingerprints to Unlock Smartphones
motherboard.vice.com
motherboard.vice.com
Secondly, you can't change biometrics. That's bad. Your retinae, fingerprints, etc. can't be reset if stolen.
Finally, there's a lot more legal precedent for passwords. As it stands, passwords are protected as "persons and papers", while fingerprints etc. are not.
Biometrics seem like an attempt to try to compensate for people's reluctance to make good, unique passwords. This is the cynic's opinion, but I don't think we can ever compensate completely for the human fallibility of any system.
If that's the difference we're talking about, fingerprint security is way better than no security and has about the same convenience.
I don't use the fingerprint sensor on my phone because I prefer better security through a relatively long password. However, I'd much prefer that someone use something than nothing. I think patterns are a reasonable alternative, as are PINs.