I'm a huge fan, there's my position at the start. I love quality historic TV productions, and as such am a big fan of The Borgias and its European cousin Borgia, of Rome, of I Claudius, and I tried very hard to like The Tudors.
I'm not sure how a viewer with no historic background knowledge of the Wars of The Roses (as we know them) and the dynastic struggle that eventually resulted in The Windsors, but I find the tale, which includes some of the present Queen's ancestors, completely gripping.
Unfortunately I know what's about to happen during most scenes (apart from the silly stuff with Elizabeth and Lady Rivers, which does not detract from the story), so my advice is not to visit Wikipedia if you don't want your fun spoiled. Enjoy this tragic and dramatic story of one of England's earlier civil wars.