Can plz anybody tell me why "Dreams In The Witch-house" is considered such a weak story by the majority?What are its great weaknesses or shortcomings-at least to that majority?
Well, there are several. One of them is stylistic -- there's much less care and precision of language and structure here than was usual with HPL; certainly by this point in his career. He also tended to fall into hackneyed tropes and ideas here: the effect of the crucifix on Keziah Mason, for instance, which -- even if given the plausibility I personally assign to it psychologically -- isn't given the necessary emotional preparation to make it a realistic reaction on her part. It relies more on shock and gore than was usually the case with HPL, and again there is less careful preparation for this than in the few other cases where he had such. The denouement, too, leaves a bit to be desired, as it provides rather a weak ending for a "cosmic witch" who has had such a lengthy reign; and the almost happy ending (the elimination of Keziah and Brown Jenkin) also has something of a weakening effect (much like that of the eradication of the subterranean entity of "The Shunned House"; though in both cases I would argue that the final lines of the stories are nonetheless quite satisfyingly done.
And, lastly, the entire plot is rather shaky and relies too much on stereotyped images, tropes, and ideas, which weakens the overall effect as well.
Not that the tale doesn't have its strengths (it does, and in some ways is a personal favorite despite its flaws); but the question here was concerning why it is viewed as one of his weaker efforts, however worthwhile it may still be....