Emphasis on this phenomenon had led some jurists (the "rule-sceptics") to doubt in more or less exaggerated terms the very possibility of describing a legal system even partly in terms of rules.

to doubt in more or less exaggerated terms = выражать несколько преувеличенное сомнение

the very possibility of describing a legal system = сама возможность описания системы законодательства/законодательной системы

in terms of rules = как свод правил