Even though this isn’t Shakespeare’s best work, it is by no means a poor work. Indeed, in some areas it exceeds his more notable works. The language is stately and pleasing. The plot doesn’t suffer from having 16 different subplots. Moreover, several of the characters, notably Katherine (spelled thus), exhibit true heroism.
The faults, however, are noticeable. There isn’t any action, and the scenes with Cranmer in Act V were introduced too late in the play to have their full impact.
“My drops of tears I will turn into sparks of fire.”
This might be an inferior play, but I’ll put that quote up with anything you will find in Hamlet or Macbeth.