Another great part of using pull requests, is that they allow everyone to see what's going on, mid-stream. They are awesome for major features, especially if you open them early on.

We all collaborate via pull requests as various features are being worked on. This way, when someone leaves a comment asking about the overall design (code or visual), suggesting a different approach, it's done while the feature is in development, not when the author thinks the feature is ready to ship.

Doing a big code review after a feature has been completely built and is ready to ship seems like a mini-waterfall process.