Yes I aggree with pre-commit code review. But there also could be remaining bugs after the code was pushed and identified to that code.
Anyway I've additional questions to that gerrit workflow:
1st: Is there any way to download these patches for review purposes and merge it to the working copy. It is very uncomfortable do do that by hand and in some cases it is necessary to test the code snippets and not only read it.
2nd: What is the meaning of the scorings "verified" vs. "Code-Review"