As an OOPL, C++ allows you to model the problem domain itself, which allows you to program in the language of the problem domain rather than in the language of the solution domain.
One of C's great strengths is the fact that it has "no hidden mechanism": what you see is what you get. You can read a C program and "see" every clock cycle. This is not the case in C++; old line C programmers (such as many of us once were) are often ambivalent (can anyone say, "hostile") about this feature, but they soon realize that it provides a level of abstraction and economy of expression which lowers maintenance costs without destroying run-time performance.
Naturally you can write bad code in any language; C++ doesn't guarantee any particular level of quality, reusability, abstraction, or any other measure of "goodness." C++ doesn't try to make it impossible for bad programmers to write bad programs; it enables reasonable developers to create superior software.