If you have ever used code review tools like Crucible, Basecamp or Github - you know about their essential feature: being able to comment a specific line of code.
With the Stack Overflow engine, I don't see how it can be possibly done, as it implies "one question one answer" scheme, while for code review you often have several issues within even a small module. Several aspects, if you want. Like formatting, performance, naming, using deprecated or unsafe calls, code duplication or plain logic errors.
P.S.: maybe Code Review should use another engine, like sibling Kiln, at least?
