Reviews can be extremely constructive when done is the right way. While on the other hand, they can be disastrous if they become a tool for personalised criticism and talk about the person rather than what the person did.
A feedback can be considered as a good feedback when:
— The person is able to receive it, i.e. making it as a pull rather than a push!
— It is specific.
— Creates awareness in the person!
— Has an impact on the person.
It really is an very important but much ignored or not-so-nicely-handled concept in lot of organisations.
The slides are available here.