Whisperer in Darkness was really bad.
The black-and-white effect was pointless, since they shot it more or less like a modern color film (not much creative use of light and shadow). The acting was mostly terrible, even for amateurs in some cases (Shifty McMustache). It ran about twice as long as it needed to, and thus was padded with incredibly boring scenes of dude hanging around the house and holograms talking endlessly. The little girl character hurt the tension/sense of dread, and only existed so the protagonist could have some Character Moments (because strong characters are one of the pillars of Lovecraftian fiction.) And then they made the obvious fatal error of showing exactly what the creatures looked like. The CGI was bad, sure, but good effects would not have saved that scene.
I was left unsure whether the film makers saw Lovecraft as straight horror or pulpy, dated camp material. Making it b&w, and pitching it as a throwback to 1930s monster movies, kinda suggests that they were keeping the movie at arm's length, not sure how the final product would strike people. If anything came across as goofy, they could call it "retro".
Call of Cthulhu was not great, but okay. I liked it, because it gave the impression of people who were not experts but at least "got" Lovecraft on a fundamental level, and Whisperer in Darkness did not.