[badsectoracula]

The problem with STL is that there isn't one of it but every compiler/C++ library/platform has its own and some are better than others. Writing your own containers at least means you take one uncertain dependency out of the scene for something that'd be all over the engine everywhere (so it isn't easy to replace later).

Though personally i'd make my own containers because i heavily dislike the API design C++ library has and i am glad every single engine i've worked on had their own (well, except in a single case where while the engine did use its own containers it was basically 99.9% the same API design as the C++ library :-P).