C++ is a three-way compromise between good object oriented design, backwards compatibility with C, and high performance. Stroustrup has never billed it as anything else.
Of course, the fact that C++ is a compromise between three goals that are often at odds means that it isn't anywhere near the best language for object-oriented design (loses to Smalltalk and many others), for backwards compatibility with C (IMO Vala does better -- YMMV), or for high performance (loses to FORTRAN). But it does a reasonable job of "good enough" on all three fronts, and that is what has made it so enduringly popular over the last few decades.
So, no, C++ isn't the best language for object-oriented programing. It's not even close. But that doesn't mean it is a bad language.