Android's innovative username is cool, but how secure?

There were a lot of rumors and conversations about the new authorization mechanism in the Android OS, but until recently it was impossible to know what it is in practice.

Unlike other phones that require entering a 4-digit number to unlock, on Android we see nine points arranged in a square and the magic inscription: “Draw a pattern to unlock” (connect the dots in the proper order to unlock). And, in theory, it is enough only 4 connected points so that the phone obediently reveals to the owner all the secret data. Giving a huge number of “unlock patterns” (and readers who are more knowledgeable in similar math than I probably will tell in the comments how many of them can be) Google hints that this is a very convenient way of blocking the phone.
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The problem lies in the fact that many lucky ones, who were already holding the first “googlofon” in their hands, speak of fat fingerprints left on the touchscreen, from which an intruder can guess your “password”. And considering the fact that most users set their “unlock points” starting from the left top, moving to the right or diagonally to the right, the task turns into a children's puzzle. By access, I recall, to personal data and Google account, and accordingly, mail, documents and other information that you would hardly want to share with someone.