my read through of 4 primary gothics has been educating and dull, dull, dull.
Melmoth, the one I'm reading now, is definitely the best of the lot. Ann Radcliff's popularity eludes me.
What 4 gothic novels did you read? I do think Melmoth the Wanderer is probably the best of them. I like Udolpho, but I think it's more important as having set the course of the genre than anything else. It's not the best gothic novel, but it is one of the first. Northanger Abbey is much better and you kinda have to ingest Udolpho to get maximum enjoyment.
Other favorites of mine are Vathek, The Monk, just about anything by Sheridan le Fanu, The Castle of Wolfenbach, and of course, Frankenstein. I'm trying to stick to the late 18th-early 19th century stuff, before the more American Dark Romantic writers kinda fogged the definitions of things.
Oh, also Jan Potocki's The Manuscript Found in Saragossa is excellent. It's not exactly gothic, but there's a significant amount of overlap. Think of it as a gothic picaresque, or a dark Arabian Nights.