There’s a surprising amount of gallows humour in the first half that some folks may find unwelcome. Personally, I didn't mind it at all.
The addition of an aide, a tragic character affected by the cruelty of a society that thinks itself civilised, lifts the remainder of the film to great heights, and that, I'm sure we can all agree, was certainly a good idea.
Don't fall into thinking the 'revenge' of the title means things have been simplified or the focus shifted. Think of it as a strong redress for a judgement, working toward proving to oneself and others that you were right all along.
4 overhauls out of 5