Get (or create) better colleagues. It's usually pretty easy to identify if people are approving pull requests that they don't understand. Pull them aside and have a professional talk about what a pull request review is. People want to do good, but you have to make it clear that you value their opinion.

If you treat the people around you as valuable collaborators instead of pawns to be played to fulfill your processes, your appreciation for reviews will transform. Remember that it's their work too.