This is well worth reading for its – comparatively feeing – stand out pieces of imagery. Warning: There is a lot of imagery to sift through!
Reading the previous reviews it seems to me that old “Houses of Parliament” Lovecraft is done a bit of a disservice by his passionate fans. They’ve elevated his works to the point where they are treated with far too much bone dry hyperbole and academic seriousness dressed up in floaty words.
You could attach phrases like "cosmic horror" to this book and claims that it deals with, “The idea that life is incomprehensible to human minds and that the universe is fundamentally inimical to the interests of humankind.” (Wikipedia.)
However, an impartial reader would be best approaching the first page with a large pile of salt poised near by to hand. The availability of pinches of salt, when required, will certainly help the armies of domestic cats featured in the novella and its phrases like "the temple of loveliness" go down a bit easier. Readers will also need tolerance for a somewhat repetitive (certainly in its ornate descriptions of architecture) imagery bombardment.
As Lovecraft noted himself remarked upon the novella:
"It isn't much good…Randolph Carter's adventures may have reached the point of palling on the reader; or that the very plethora of weird imagery may have destroyed the power of any one image to produce the desired impression of strangeness."