Totally agree that more code reviews are needed. I guess then the question becomes, how do you teach someone to do a good code review. Code reviews come from experience I get it, so if you are a junior programmer then you get your code reviewed by someone senior. But there is also one very important part to a code review. It being able to give good advice to someone. Not to be over critical but to provide help that is actually going to build someone up. At a company I use to work at, they did this beautifully.

1) Every check in required a code review by a peer. In your commit statement, you specify who reviewed your code.

2) If a senior programmer wrote code for a feature that wasn't too complex he would get a code review from a junior programmer. The junior programmer doing the code review, learned what good code looks likes and second learned how to give feedback in a constructive manner as he was talking to someone with more experience than him/her.