I think for me the voice acting of that opening was so good and distinctive that the writing felt completely natural, but it's certainly verbose and I could see how it comes across as pretentious to some people.
I quite enjoyed that bit personally, especially the "evil apes" bit that I thought was quite funny. It's an early example of the use of the dialogue system itself as a means of introducing pauses in the delivery for comedic effect, which this game is brilliant at at times.