Very much like the story of Henry VIII himself, the real intrigue and scandal of the story is in the whole Anne Boleyn affair. Once the pursuit, seduction and ensuing drama take place (and conclude by the end of Season 2), you feel like "What's next?"
As a student of the period I excused some of the historical inaccuracies (dramatic license I suppose) so that did not bother me.
Middway through Season 3 I told a friend of mine who also watched the show that this cannot go any longer especially since they seem to focus the story on Henry. What would have been interesting would be to see a little more about Elizabeth I - the show is "The Tudors" after all and not just "Henry Tudor" :) By the time I reached the finale I felt like I was watching more out of an obligation to completing the series than anything else. Maybe if it had the EI I would have been more engaged. But so be it. It was a fun ride while it lasted!