It's just a constant litany of clearly fatal flaws interspersed with "great game though!"

"It may not be the most impressive technical achievement and it is certainly cursed with a lack of enemy variety ..."

"... Legacy's plot has more holes than a fishnet stocking and sorta just expects you to accept that its magical world makes no sense."

"If you're like me, you'll roll your eyes during moments when you're introduced to 100 years' worth of dead characters lecturing you from paintings ..."

"... a not-too-convoluted good-guys-versus-bad-guys conflict that ends up being an enjoyable tale, even if it's not particularly profound or original."

"... Legacy's dicey performance ... suffered from just about every issue that makes IGN's performance review team cry ... framerate inconsistency, weird issues [with] the lighting ... aggressive pop-in, and more ... every door in Hogwarts has a brief loading screen ..."

"... a fairly glitchy adventure in general ... You'll probably fall through the map a time or two, or see a character or object get caught in the environment, or maybe even have the person you're talking to just up and walk away ... leaving you to speak with the empty spot ..."

"... the creatures you fight soon run out of tricks up their sleeves ... the enemies Legacy throws at you wear thin pretty quick. ... there's practically no variety ..."

"... Quidditch is nowhere to be found. The lore reason ... feels like an attempt to paper over the absence of a major aspect ... that the developers must've just not had time to include."

"... you'll be painfully disappointed in Legacy's abysmal inventory space ... it never stops being a major pain in the cockatrice ..."

"It's certainly weighed down by technical issues, a lackluster main story, and some poor enemy variety"

Verdict: 9/10 (Amazing; "We expect to look back at it as one of the highlights of its time and genre" — not quite the impression I got from the review!)

For perspective, games given a 10 by IGN include God of War, The Last of Us, Breath of the Wild, and GTA V. Other 9s include Batman: Arkham Knight. 8s include The Outer Worlds.