[Chetane]

> my company decided to move just to use pull requests as a poor man's code review tool

Using Git, and using pull requests as code reviews are two very separates things. Many people addressed the first point (e.g. Why git is totally fine), so I'll focus on the second one: code reviews with Git. Pull requests is one of many ways to do it, which I personally find difficult with bigger teams working on non open-source projects. I'd recommend looking at Phabricator as a code review tool that works really well in teams.