but reading people describing it as their favorite game ever is vaguely bizarre.
Why?
Because almost everything about POE II was more or less mediocre, bar some fairly pretty visuals for the genre (especially compared to the predecessor, which at time was downright ugly).
You are certainly welcome to your opinion, but I don't share it. I quite liked PoE 2. I won't claim that it was a perfect game of course, but I found the setting to be interesting, and the itemization was (again, IMO) quite good. I would really like to see more games follow the path of unique and upgradeable items sprinkled throughout rather than have the strongest items gated by the end game.