I'm also quite partial to "The Bookstall", which had a good deal of his dry wit. One of my favorite lines -- just as it is one which Joshi has quoted as quite delectable -- is "Go smell the drugs in Garth's Dispensary!" (l. 50), referring to the poem of that title by Sir Samuel Garth, an allegorical poem of some length and antique charm. (Garth was also the one who put together the edition of Ovid of which Lovecraft was so fond -- what HPL referred to as "that marvellous literary mosaic", Garth's Ovid; and the part of that which of he was fondest was, not surprisingly, The Metamorphoses, which had such an impact on his own fiction.)
Yes, when it came to his satirical poems, he was often quite good -- frequently barbed, but not infrequently as barbed at himself as others....