This will probably get lost in all the irrelevant bullshit discussed here, but here's my quick review of the game, after completing it to 93% and finishing at level 38. Took me around 40h.
It was fun. Some quests are pretty cool, with nice "awesome" moments. On the other hand, everything felt very scripted, and just a shallow. Still fun, but shallow.
It was waaaay easy. Game dishes out experience and good gear at you, if you do modicum of exploration. As soon as you have any gear with stats in the 80s you're set, getting anything higer doesn't really matter. Getting beast and plant materials is trivial. Winning broom racing or dueling is trivial. Only thing that I can't complete is bloody Summoning Challenge 5.
Combat is mostly very easy, and I feel there is some enemy scaling going on. Fightning single big enemy is easier than fighting multiple mobs. I've played almost whole game with Pull, Levitate, Fireball, and Expel Wand as my main spells, with Push, Freeze, Ignite, and Slice as my secondary. Worked excellent for 90% of the fights. After you hit level 35 everything just feels trivial, with big meanies like Trolls just being a chore and not a challange.
It was beautiful. The world looks great, Hogwarts is amazingly detailed. Villages look rustic, costumes vary from whimsical to really posh late 19th century. You can look like a crazy wizard murder hobo, or as a distinguished gentelman of many magical talents. Flying around on your broom is just joyous. It is also very shallow, and artificial world. There are some scripted things happening that are meant to make it feel alive (goblins fighting trolls, goblins fighting spiders, etc.), but it still feels like watching a nice postcard and not being in a living, breathing world.
Choices and consequences do not exist in this game, at least I didn't feel any impact on the stuff I said on the world or the ending. Build variety doesn't exist either. You get 40 talent points in total, and there is 52 points you can spend. Expect stealth is useless bullshit, so you won't waste 4 points there. Spending 8 on your potions upgrade is debatable, as crafting the buggers involves real cooldown timers. Person who thought it's a good design should be kicked in the nuts, or their gender-of-choice equivalent. There are couple evidently good options to choose there, and I really didn't feel the impact of anything more I did after spending 20ish points (first upgrades do feel nice though).
Casting unforgivable curses also has no consequences, so enjoy your crucio and avada kedavra.
Best quests are side quests (slytherin dude trying to heal his sister), and treasure hunts where you only get a map and no freaking quest compass. Main quest is perfectly servicable though, and has some nice moments.
So, overall, I'm quite amazed that something so shallow and un-rpg was still fun to play. Might be getting old and loosing the refined taste. Don't think many codexers will like it, but I did. It's also a cool game to play, or just faff about with your kids.