I have also heard it said by many that Bernard Cornwell is not necessarily a good historic fiction writer. No idea about his use of infodumps (not read him) but a friend of mine who is a fairly good Napoleonic expert (particularly military history) has a lot to say about his lack of knowledge of the period...
I'm interested in this.
I read Bernard Cornwell and I'm told that he is pretty good on his history. It's certainly convincing in a way that many other writers aren't. I'm guessing he's pretty sharp - but your friend is, according to you, an expert - so he finds fault.
I've written two historical novels. One was based on James Brooke, the first White Rajah of Sarawak. I got really interested in this guy and did a lot of original research up to the point where I could spot the errors in scholarly biographies. I easily picked up the mistakes in the Flashman book (though I don't go round telling people that MacDonald Fraser doesn't really know his stuff). But all this factual info got in the way of the story. It was only many years later, when I had forgotten the detail, that I was able to write the work of historical
fiction that I wanted to. And people straight away start picking up on errors. (Apparently there is a reference to a hansom cab that is out by a decade or two.) In fact, because I was still reading round the subject after the book was in print, I found the odd mistake myself. And I didn't care all that much - but I worried that I should care. But you've put my mind at rest. If an expert is picking at Bernard Cornwell, I think it is safe to say that there aren't many historical authors who aren't making mistakes.
The second book was set in the Indian Mutiny. I wrote it because it was a period that interested me and then I did a lot of reading specifically to research the novel. But there are forums on the Net where people try to identify by name every single one of the hundreds of soldiers killed in some of the actions there. There are whole libraries archiving all the papers that Victorian soldiers, civil servants and politicians wrote about the Mutiny. There are survivors' accounts, Indian prisoners' accounts and, in some cases, the accounts of the victims, written before they died and discovered posthumously. No one could read them all. So someone, somewhere, is feeling smug that they have read something that shows one of the mistakes in
Cawnpore.
You have to remember that the historical background is there in the service of the story.
Cawnpore is probably a better book because I used my imagination more. It's difficult to avoid info dumping (I know I do it) but it's worth making the effort because it's not only boring for readers but you do it most when the desire to show off about your historical knowledge is greater than your desire to write a good book. It's a symptom that you have, literally, lost the plot.