Moisés Silva, back in 1994, penned some great thoughts on the hermeneutical importance of systematic theology for biblical studies:
The exegetical work of John Calvin, as well as the theological system associated with his name, can be of great help as we seek to develop principles and methods of interpretation. Calvin’s commentaries are a model of clarity and excellence. In addition, his work – in line with the doctrine of common grace – reflects a critical appreciation for the contribution that unbelievers can make to our understanding of truth, and this feature has some interesting implications for modern evangelical scholarship.
A more controversial question has to do with the relationship between theology and exegesis: While biblical scholars tend to ignore or even reject the value of systematic theology for their work of interpretation, it can be argued that theological commitments inevitably affect the process of exegesis and that such an influence is both essential and desirable….
[D]uring the course of over two decades, Calvin’s theological thought guided his exegesis, while his exegesis kept contributing to his theology. (An Introduction to Biblical Hermeneutics, pp. 250-51)
I am convinced that one of the biggest contributors to bad exegesis is bad systematics. The provisional system that systematics provides the exegete honours our centuries-long heritage of biblical interpretation, by setting faithful prejudices in approaching the text. Such prejudices are, in turn, open to refinement by careful exegesis.