I'm not sure about MM being "by some margin" the most famous novelist to write a Doctor Who novel.
You could be correct. I suspect I'm being biased here by my age and social group. I recall Moorcock being quite a byword among the people I know who were interested in SF when I was a teenager, and I notice his works and characters getting referenced a lot in genre fiction and fan fiction. I'm much less aware of Baxter and Reynolds just as a part of the background noise of fandom, but that doesn't mean that they aren't more famous in terms of the wider public and book sales.
no subject
You could be correct. I suspect I'm being biased here by my age and social group. I recall Moorcock being quite a byword among the people I know who were interested in SF when I was a teenager, and I notice his works and characters getting referenced a lot in genre fiction and fan fiction. I'm much less aware of Baxter and Reynolds just as a part of the background noise of fandom, but that doesn't mean that they aren't more famous in terms of the wider public and book sales.