Bertrand Russell is one of my favourite Philosophers (David Hume is definitely top). I love HWP. I've been reading it on and off for ages.
It's quite a known fact that Russell disliked Nietzsche's work. Russell was reportedly so disgusted with Nietzsche's work, that he threw one of Nietzsche's books across the room and did not complete his reading. This, whilst quite funny, was a bit childish and some bias probably came through when writing HWP.