Thank you for posting the high-resolution scans.
I have to say, other than a few cards, the art for this expansion is tremendous. The events and landmarks feature some of the best art in the entire game and almost all of the art for the events and landmarks is good to great (e.g., Annex, Bandit Fort, Defiled Shrine, Keep, Mountain Pass, Obelisk, Tower, Triumph, Windfall).
For kingdom cards, Castles is stunning from top to bottom and may be my favorite art of the set, if not all of Dominion. No matter how this pile actually plays, I cannot dislike these cards because of that art. Chariot Race, Enchantress, Overlord are also great and immediately memorable. Then getting the job done is Archive, Bustling Village, Catapult, City Quarter, Crown, Emporium, Encampment, Engineer, Farmer's Market, Forum, Legionary, Patrician, Plunder, Sacrifice, Settlers, Temple, Villa, and Wild Hunt.
Rocks and Capital are certainly not bad but they don't do much for me. Groundskeeper and Royal Blacksmith seem wonderful at first glance, but the anachronisms are frustrating and confusing. At least the glasses on Royal Blacksmith don't seem too noticeable. Battlefield looks like they are fighting on a cloud. Wolf Den has a style of art that I generally like but the positioning of the wolves is strange. Charm has framing issues that makes the art look cluttered, in addition to the other complaints in this thread. Gladiator is actually not that bad by itself, but the art for Fortune is disappointing on so many levels, especially in light of the fact that this is such a unique and fun card.
EDIT: I actually like the Gladiator/Fortune randomizer art. In fact, all of the art for the split pile randomizers is really good. That settlers/bustling village randomizer art!