Q. Do you have any ideas for where I could find an appraisal of the corpus of Pseudo-Dionysius?

Attached is an article about Pseudo-Dionysius (a.k.a. Dionysius the Areopagite) from the Encyclopedia of Religion.  The bibliography at the end of the article recommends sources for further study.

 The Cambridge Histories Online include a chapter on Pseudo-Dionysius that might help contextualize his corpus:

Sheldon-Williams, I. P. "The pseudo-Dionysius." The Cambridge History of Later Greek and Early Medieval Philosophy. Ed. A. H. Armstrong. Cambridge University Press, 1967. Cambridge Histories Online. Cambridge University Press. 01 March 2011 DOI:10.1017/CHOL9780521040549.031

 You may also find abundant articles (and some of them are online) about Pseudo-Dionysius in the ATLA Religion Database.