Sure, an implication of quality exists, but I'm referring to the whole package: the writing (holy crap), the combat, the MMORPG-esque items (what's wrong with the classics?), the romances (which you touched on...they move at a breakneck pace compared to the partners in the second game and they're often needlessly vulgar for the sake of vulgarity), the racial designs (how do you botch Elves?), the music, the voice acting (performances that feel so very contemporary by comparison), the focus on explosive spectacle* instead of a slow-burn, the recycled Larian assets (including their particular favored genre conventions), lore discrepancies, et cetera. Honestly, they'd have been better off creating a brand new adventure in The Realms. You'll notice I hadn't mentioned the titular city.
* The invasion angle adds too much of a science-fiction element, in my estimation.
In addition to the aforementioned inconsistencies, I have two pet peeves:
1.) There is no day/night cycle; the present scene shifts to nighttime when you deliberately choose to make camp/rest, but it is entirely under your control. In the original game (a quarter-century old by this point), night comes whether you desire it or not. Ultimately, xx3 carries a degree of artificiality reminding you that the world is - at least in this regard - catering to the player instead of functioning like a living environment.
2.) Minor spoiler.
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Of the returning characters, at least two of them are not represented by their original voice actors; their replacements are a bad fit, to say the least.
Finally, how about a horde of bugs - from nearly game-breaking to merely tiresome - that puts the state of Florida to shame?