Played it and satisfied so far. Aside from some weird lighting in the Prophet cutscene, the game looks good. I had a slowdown near the granaries in the Andorhal mission for some reason.
Played up to and including Stratholme, which looks exactly like in the demo. Even the WOW bosses are still in but I would have liked even more references.
I saw a comparison of the new and old Stratholme cutscenes and I am really glad they got rid of them, the animations are so terrible in that one. I'm glad I don't have to watch that tripe for over 5 hours.
It's nothing groundbreaking but I never expected it to be. I got a graphical update and some remade missions and I am happy with that. I would have liked more but such is life, for me the graphical update was the most important and for the most part it's good. With the new assets I might make the new campaigns I wanted blizzard to make. Maybe make a post-WC2 Blackrock campaign.
Are you sure about Custom Campaigns? The functionality is still in the editor. Perhaps you get the functionality after you finish all the campaigns? Maybe they forgot to add the button, which would be embarrasing. Custom campaigns with new models is one of the reasons I bought this.