Tony quotes Jerry Weinberg.

Software reviews are a useful method of on-the-job training. They also greatly improve the quality of code that is produced but not all programmers can or will do it.

Reviews are usually rather clumsy at first, but even without outside help, reviewers soon learn to do a much more efficient and effective job.

Not all programmers make good reviewers. Some programmers make such a bad job of this that you start having to review the reviewers. In my experience the worst type of reviewer is the senior programmer who resents having to waste time looking at other people’s code. They either spend five minutes on the review and pass everything or fail everything with really scathing comments about the stupidity of the developer – neither or these things is helpful to the project or the team.