There are lots of basic ways to evaluate information--by type, resource, purpose--but evaluating policy information can be even trickier. Below you'll find some resources for evaluating evaluation reports (very meta) and think tanks.
Just because a review has been published as a "systematic review", it does not imply that the review was rigorous, reproducible or exhaustive. There are a number of criteria by which you can assess the quality of a systematic review. Below are the two most common tools used for this purpose.