I've been playing the Harry Potter game with my kids, and I think it's really good. (We've finished games 1-3.) Who'd have thought USAopoly had it in them!
It's definitely easy, but I totally don't mind that. I'll be happy if in the latter half of the games we lose a couple times, but I don't see why banging our heads against a game repeatedly would be that fun, in this particular case.
It's a really nice example of how to turn a beloved piece of long fiction into a legacy-style game. It also ramps up in complexity, which would probably be frustrating if I were playing with my gaming pals, but with the family, it's perfect. My teenage daughter who just became obsessive about Harry Potter a few months ago but never really got into boardgaming now knows how a deck-building game works!
The mechanic I like a lot that I haven't seen in many other deckbuilders is how some cards do special good stuff when you discard them due to a bad guy effect. It's really satisfying to reverse that effect into something cool, judo-like.
I will also endorse the game, especially for families with kids who like HP. I mean, yeah, if you don't like deckbuilders or you don't like co-op games, this isn't for you, you pitiable soul. Otherwise, if a short co-op campaign with a lot of flavor sounds fun, then you should take a look.