You have to know which bits to read. His best short stories are the crispest, sharpest, funniest short stories in the English language: there is not a word wasted, and every joke works. Some are light and vicious, some are dark.
Read The Open Window, Sredni Vashtar, Tobermory, The Storyteller, and then you'll either be hooked or not.
Most of his work is now quite dated, as it's about the world of the English upper classes before the first world war. But it's a fascinating view of that world.
Such a pleasure to read these short stories. They are beautifully written. The character descriptions are at times hilarious but the subject content is true to life. I have never ever enjoyed reading short stories, they usually irritate me with their shallowness but these are brilliant. I highly recommend this book.