whoa, that is a hot take because Harvey absolutely killed the role to the point I would call it a perfect performance
The reason why Tarantino became who he is now is because of Keitel. Harvey got the script for Reservoir Dogs and decided to take the role IF he was the producer and partial financier. Keitel was also the biggest star of the movie at the time so it would never have gotten green lit if it wasn't for his cachet. Basically, Tarantino owed Harvey BIGTIME and bent over backwards to shoehorn in his character into Pulp to pay homage.
It is a superfluous character that adds NOTHING to the story. I
mean, if you shoot someone and have a bloody car do you REALLY NEED someone to tell you to clean up the car? How many cleaners are sitting around pools at 8:00 AM in full tuxedos? It is just baaaaaad writing but IMHO Keitel's line delivery isn't very good. His 'best line' is him nodding while sipping coffee with approval, but the rest of his lines fall flat IMHO.
The Wolf wasn't needed. If that character was cut the movie still works. It was a ham-fisted way to work Keitel into the script, and it simply is bad writing.