Complaint thus far:
Running the game in windowed mode kills my gameplay. Characters look like they're skipping, audio skips, dialogue sounds chopped. Doesn't seem to matter what I change my settings to. Conversely, if I crank my settings all up to max I can play in full screen with a solid 30fps and no hangs.
Then, there is the 6-minute loading after I launch the game and it just sits there.
Cool stuff thus far:
Spell icons.
Seeing character in different class clothing.
Casting animations and AOE indicators.