In writing about Gladys Mitchell, the least known to U. S. readers of England's Golden Age "crime queens," I have observed frequently that she is something of an acquired taste. Her quirks, her English eccentricities, the very odd personality and occasionally unnerving humor of her heroine, Mrs. Bradley, all take some getting used to.
But that doesn't mean you shouldn't make the effort to meet her - or that you won't enjoy the effort. You might want to start by reading some very well-thought-out commentary by mystery scholar Nick Fuller, writing at the Golden Age of Detection Wiki (Nick's comments start about halfway down the page). He has studied her works and, I think, has read them all, and you can see his ratings of her books at the link.
In looking back at my own postings here, I see that I have done audio reviews of six Mitchell novels, and you can find them on my backlist page, alphabetically by author and title. I like all of these, but I'm particularly fond of "Merlin's Furlong," because the plot has such a shaggy-dog quality to it, as the characters become hopelessly confused among the many places in the neighborhood that incorporate "Merlin" into their names.
There are more Mitchells on their way from publishers including the Rue Morgue Press, and I'll have reviews of some in the weeks and months ahead. I really do think it's worth making the effort to meet Mrs. Bradley.