C is great for some things, but not at others. For instance, the same simplicity you laud makes it very difficult to work with strings or serialization—both are highly manual operations. So—I agree generally with your sentiment, but it's very far from a perfect language. If you're working with word-sized integers it's pretty damn good.

Also, ironically, I feel like C presents an excellent case for an evolved language, not a designed language. Its very name is derived from BCPL, as are many of the semantics and notation.