That's the thing: going beyond what the parent commentor said, tools that "work as advertised" can still be bad.

"Pure wire-mesh electric blanket -- no insulation whatsoever! Only $20 dollars. Will raise the heat with sparks of electricity, plug directly into your 110v outlets!".

Sure, works as advertised. But it's ill concived and will fry anybody trying to use it, either because he wants to or because he is forced to (by his boss or needing to deal with legacy code in the case of a programmer).

The example is contrived to showcase the point, but the gist is: "works as advertised" doesn't mean much with regards to quality or well thought-out architecture.