First: I will have to fall more on Extollager's side on this one: The entire "Herbert West" series is distinctly overwritten... and, apparently, from the correspondence, quite deliberately so; originally to go with Houtain's statement that "You can't make them too horrible" (that is, "more is better"), and later because HPL became so despairing of writing anything like this having any artistic integrity, he decided to simply make it self-parody. The passage quoted above is overcolored (at the least) because of the hammering home of extreme terms not prepared for by the text which has gone before; any term may be appropriate, if the use of that term is in conformity with the careful emotional modulation of the text as a whole. Here, it is not.
Second: On that particular phrase from Bulwer... as has been said many times (including by the person who started the "Bulwer awards" contest) there is absolutely nothing wrong with that phrase in itself; it is simply a descriptive passage, as a night can be dark or (relatively) light, depending on the moonlight, cloud cover, etc., and it can be calm or stormy... so the phrase itself is perfectly fine. It is what comes after that portion of the sentence... at which point the sentence begins to simply fall apart. It is in his novel
Paul Clifford, first chapter, and the full passage is as follows:
It was a dark and stormy night; the rain fell in torrents -- except at occasional intervals, when it was checked by a violent gust of wind which swept up the streets (for it is in London that our scene lies), rattling along the housetops, and fiercely agitating the scanty flame of the lamps that struggled against the darkness.
-- The Works of Edward Bulwer Lytton, vol. VIII, p. 235
About the main point in favor of the sentence as a whole is that it is cyclical, returning to its beginning with the sense of darkness overwhelming the light, and storm as both a physical reality and a metaphor for what follows in the novel. Otherwise -- Bulwer was painfully awkward here.
Not, however, always. He could also be quite good (though he was most often uneven), and at his best, quite powerful (see, for example, certain passages in
Zanoni,
A Strange Story, or "The Haunted and the Haunters; or, the House and the Brain", the latter of which still remains perhaps his most famous and often-reprinted story (and is also recognized as one of the great haunted house tales in general). He was, as has also been pointed out, the recipient of praise from Dickens, Mary Shelley, and (alternating with villification) Poe... who rather hit the nail on the head with both his strengths and faults....