[std_throwawayay]

It failed by teaching that every data structure should be put into classes using many levels of inheritance, interfaces, encapsulation, accessors and the whole shebang when the thing really is just a plain old integer. OOP is really useful and powerful in many areas and applications but it is not the only tool that has to be used for everything.

[jpindar]

That sounds like a failure of the teachers then, not of OOP.