These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Tudors
Crosses the Line Twice: Getting Cromwell sentenced to death on trumped up charges was fine, plus about what you'd expect for political enemies in the show, but it was probably not in very good taste to get his executioner drunk to the point where decapitating him took five hits of the axe.
Thomas Cromwell. Critics agree, James Frain is one of the best things on the show. He will be missed. Apparently Henry, doing his typical later reflection, would agree (about Cromwell that is. I don't think the real Henry knew Frain).
Cardinal Wolsey was no slouch when it came to some magnificent bastardy on his party playing the political games of court and European politics like a pro. His later downfall from Henry's favor is made more tragic because it was largely to outside circumstances than anything he did aside from taking the pension from the French that is.
Edward Seymour shows flashes of this. So does his wife: especially in the last few episodes. Which is appropriate; historically Edward and Anne Seymour were quite the evil power couple, but apparently there is no such thing as a functional marriage on this show, hence Anne having two on-screen affairs.
Moral Event Horizon: After seeing Thomas Culpepper rape a game keeper's wife and then kill her husband when the man tried to bring him to justice, with no remorse and instead a tad of annoyance what's coming to him can't come soon enough.
The siege of Boulogne, due to a combination of dodgy CGI and even dodgier French accents.
Jonathan Rhys Meyers' attempt at acting like an old man in the last two episodes, which largely consists of a hoarse voice about on par with Christian Bale's Batman, and random pauses that come off more like he's having trouble remembering his lines.
Anne Boleyn. When she first appeared she was hated by most of the fans (for just being Anne Boleyn and a lot of biased history writers paint her out as the villain) but quickly grew into the perhaps most beloved character on the show (at least in its first two seasons). When she met her demise a lot of fans said they didn't want to watch anymore now that she was gone.
Mary Tudor also arrived with a lot of negative historical baggage but her portrayal as a seriously flawed yet very sympathetic character won viewers over. At the end of the show many fans were expressing disappointment that they wouldn't get to see Sarah Bolger's take on Queen Mary.
In one episode Henry passes a poor woodsman on the road and casually confiscates his wife for the night. The wife in question is Katie McGrath, who was working in the wardrobe department at the time, and is now currently starring as Morgana on Merlin.
Why was the woman three queens back executed? (Officially, at least.) That's right, for adultery. And what happened to the men who were accused of being her lovers? They were executed too, right again! So, explain to us...how is it a good idea to have mad passionate sex with your lord and master's new trophy wife, and vice versa with the staff?
Also Katherine Parr, a bit. Appointing the guy who was just stripped of his bishop's role for suspected heresy as your chaplain is a bit of a risk, as her sister points out.
What The Hell Casting Agency?: An initial reaction to hearing Joss Stone would be playing Anne of Cleves, casting a singer with no previous acting experience in a difficult part that also involves speaking with a foreign accent sounds like a recipe for disaster. As it turned out, she was very good. Although one still wonders why she was cast as the wife Henry deemed too ugly for him to be able to procreate with. She was initially supposed to play Jane Seymour but had to drop out due to scheduling conflict. (Although, courtiers writing after Henry's death apparently said that Anne of Cleaves was the most beautiful of Henry's wives and some people think that Henry became impotent at this point due to weight gain and blamed Anne.)
Anne of Cleves, until Henry divorced her. Then she became the happiest (as well as luckiest) of his wives.
Suffolk in Season 3 turns into an Anti-Villain after Henry and Cromwell's ruthlessness becomes too much for him. He's haunted by his actions against the northern rebels, his wife miscarries a child, and he ends the series as a jaded, tired old man.