You'll have to search very long to find a C++ game code-base that uses boost, game devs are not that stupid ;)
Also, Unity games are usually written in C# (I think it's quite safe to say that - overall - most games are not written in C++ but in C#), yet I've seen no data so far which would indicate that Unity games have any less problems than games written in C++ during production and after release (if anything, the opposite seems to be true, not for technological reasons, but because Unity is so much more beginner-friendly).
I'm no fan of C++ either, but blaming a programming language for bugs and quality problems without any counter examples at hand is a bit ridiculous.
Also, Unity games are usually written in C# (I think it's quite safe to say that - overall - most games are not written in C++ but in C#), yet I've seen no data so far which would indicate that Unity games have any less problems than games written in C++ during production and after release (if anything, the opposite seems to be true, not for technological reasons, but because Unity is so much more beginner-friendly).
I'm no fan of C++ either, but blaming a programming language for bugs and quality problems without any counter examples at hand is a bit ridiculous.