I thought Anne Cleves was fine looking.

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In the show, I think Henry resented her for many reasons other than him just not considering her attractive:
1) The infected, rotting ulcer in his leg hurt like a bitch and he was mean to everyone because of it, especially people closest to him.
2) She was a constant reminder that Jane was dead.
3) He was too weak-willed to admit that he lacked virility in his aging, pained state, and blamed it on Anne. "Of course, I'm not sterile! She's just too ugly!"
4) Cromwell made the sketch artist portray Anne as some kind of goddess-level beauty. There was no way poor Anne could live up to Henry's heightened expectations.
5) Henry's leg stunk but he was too prideful to admit it; of course, Anne was the smelly one with "evil smells" about her.
Henry was an utter douche to her in the show. I'm glad she managed to escape him.

IRL:

Henry was an old, crabby narcissist who went charging into Anne's presence in one of his infamous "I'm pretending to be a rakish Robin Hood!" masquerades.

Problem is, no one had bothered to tell Anne that the English king insisted on dressing up and behaving like a man-child, or in carrying out elaborate "GASP, OH YOUR MAJESTY, I HAD NO IDEA THIS WAS YOU!" theatrics that Katharine of Aragon handled with so much tolerant grace.

So Anne became confused as to why this hideous, stinky, limping old man was pestering her, and why he entered her presence without an audience, and proceeded to ignore his attempts to "woo" her by watching the bear baiting, which insulted Henry very much; and by the time she had overcome her, "Wait, this is the king???" and apologized, he'd been "humiliated" and wanted nothing to do with her.

Looks or not, it had nothing to do with anything other than the fact that unlike her predecessors, who were warned of his massive ego trips, Anne didn't fall at his feet and stroke him by pretending he was the tall, gorgeous, handsome, chivalrous man that Henry considered himself to be in his own mind.

Instead, she collectively went eww and ignored him.

Irony is, they became rather decent friends after awhile -- but naturally, when you limp in to see your bride, you expect to be recognized (even if she's pretending she doesn't know who you are!).

Anne got the best deal out of all of his wives. She only had to tolerate him for a few months, agreed to divorce, and enjoyed a rich life of leisure in his kingdom while respected as a "sister" of the king.

Much better than ending up on the chopping block. She's lucky he wasn't attracted to her! It probably saved her life.

I like her not!