OK, I burned one of the bad games again on one of my Verbatims and kprobed the discs:
Game | PI Max | PIF Max | PI Avg. | PIF Avg.
----------------------------------------------------------------------------------
Game 1, Verbatim from friend | 45 | 4 | 2,05 | 0,25
Game 2, Verbatim from friend | 48 | 6 | 2,01 | 0,31
Game 3, my Verbatim | 24 | 5 | 1,61 | 0,04
Game 1, my Verbatim | 39 | 4 | 2,10 | 0,08
Game 1 and 3 on Verbs bought from my friend have install problems, the others don't.
1st impression: PI and PIF depend a lot on the game. Even on the same type of Verbatim the values for Game 1 and Game 3 differ a lot.
2nd impression: the Verbatims I bought from my friend seem to be worse than my own. The same game has a lower PI value on my Verbs. The average PIF values are way lower on the Verbs I bought myself.
3rd impression: PIF is more important than PI. The two games having install problems have much higher average PIF values.
Now we are in trouble. Buying Verbs in stores is very expensive. But if you buy them in the web, you don't know if you will get the good ones produced in Singapore.