There is much that is quaint and at times incomprehensible to us in this document. It reflects a lost age. On the other hand, the parts about Trial by Jury and not punishing someone without following the law of the land, and no taxation without the approval of Parliament are legal ideas we still hold dear to day.
But the most important part of the document, from my perspective, is the fact that the SUBJECTS of a monarch, for the FIRST TIME in relatively recent history, took an abusive tyrant to task and forced him to recognize their rights.