I'm not unreasonable. I'm prepared to admit that sometimes it's okay. I've just reread Mortal Engines, and though most of the novel uses past tense, occasional passages are in present. Unexpectedly, this works. I first read the book before I began to write, and didn't even notice.
I've used present tense myself. In my short story, Mr Conway's Heaven, the protagonist narrates, and the whole point of the story is that he doesn't know what is coming to him.
But what's rattling my cage right now is trendy historians on radio and television using present tense to describe historical events, when historical events by definition happened in the past. This invariably has me gritting the teeth and muttering, "Henry VIII is not marrying Anne Boleyn now. It happened nearly 500 years ago! If that doesn't merit the past tense, what on earth does?"
Where will it all end? Do we face a depressing future when any tense bar the present is quaintly old-fashioned and used only by pedants?
Researching the topic, I see I am not alone. The modish Melvyn Bragg was criticised for abuse of the present tense this summer, and quite right too. Grrr.