"Best classic fantasy"? Really? Interesting. Not my take at all. Good at times. Definitely. Harrison is a great lyricist, for lack of a better term, when it comes to words. But not exactly a great storyteller by my take.
Perhaps my take is skewed. I read the first work after having cut my teeth on Tanith Lee and Michael Moorcock and even some early Storm Constantine and so really didn't see what was so significant or stunningly unique of his work. Except that there was an underlying, almost desperate, attempt to show what a different and unique. Oddly, or maybe not, I see this in the latter works more than the two earliest.
I thought the "Viriconium" collection was a nice and timely reprint and was glad to add it to my library as I didn't have all the works presented in this new volume. But Harrison's style just borders, if not passes over into, over-affectation to the point of sheer self-indulgence. Detracting to say the least of what otherwise could have been some really great work. The prose a bit too contrived -- like the guy who grows a goatee and wears all black to show how serious he is while sitting in the coffee house reading something oh-so-profound. Apparently Viriconium from the sounds of it.