Disappointing ...

... and I am a Buñuel fan if there is one!
It is not lengthy, it is the opposite, entertaining, maybe too entertaining.

But what strikes me: Buñuel was much too much a psychologist to actually believe this lousy psychology of a man becoming so lopsided by merely watching a dead, bleeding, servant. That would not explain his obsession with fire, neither.
Another one: with Carlota, aside of the last minutes, I can't see him having 'noir' plans. I rather see him clinging to her purity as possible remedy.
Additionally, he is a tad over the top by insisting on all his crimes in front of the police. Has he eventually planned all this to enter some limelights?
Logically, with the nurse unfortunately falling down, why would he not rather look for another target, instead of trying to explain that he didn't want to shave?