First of all, I'm not exactly a Harry Potter fan. I saw the first movie approximately 20 years ago and that's about it. What I know about it, I know from cultural osmosis. But when I saw that this set exists, I had to order it the very same second. 'Classic' castle Lego sets are my weakness after all.
I have no problem with it being a micro scale. Because even at that, it's an enormous, imposing set that will demand a lot of free space to display. Even though this set is sporting more than 6000 pieces, the build actually isn't a slog. Granted, there were a few spots where there's a lot of repetition, but these were few and far between. Otherwise they did a great job with mixing up various build styles so you're never stuck for too long on the same section.
My only wish is that the instructions could be clearer on some spots. I encountered this problem only while building the bases where you have to put a lot of 1x1 pieces and the instructions just show the whole base area with no highlights. I remember quite a lot of 'pixel hunting' on those sections to see where to put my pieces.
Now, I did notice some complaints about the number of stickers. Personally, I have no problem with them. They're optional, as far as I'm concerned. I usually don't use them, because I like to reuse my bricks for different builds later on. Almost all of the stickers are for the interior areas anyway, so if you're using this set as a display piece, you won't see them anyway.
Another thing is, that for the first time in my 25+ years of buying lego sets, I got some pieces in the wrong color. Three of them and all of them were 2 x 1 tiles. I triple checked that I didn't made any mistakes. It wasn't too big of a problem, since they still fit with the general color scheme of the set. But just something some people should be aware of in case if it happens. So, you're probably not missing any pieces, they're just the wrong color.
All in all, a fantastic, beautiful and detailed set with great value for the price. Some minor problems, but nothing that would stop me from recommending this to everyone. If anything, I noticed a lot of interesting lore during my build, so I think I might as well read the Harry Potter books (or at least watch the movies) to see what's it all about.
P. S. My cat loves it too.