DA and ME have bad dialogue - at times - for modern AA games that have to compare themselves to high quality movies and TV ("good" is e.g. breaking bad on an off night). BG1 has bad dialogue on the level of bad internet fan fiction. There are levels of awful here, and "can be said by humans without everyone breaking into uncontrolled laughter" is a threshold BG1 does not always cross.
To say that BG1 was better than, say, DA:O or ME1 is absurd. Hell, ME1 is BG1 with just better characters and more story (and a different combat system). Hell, DA:I is basically BG1 with better dialogue, characters, and story. It's just so weird to focus on BG1, which is a game whose basic features Bioware's always tried to recycle when going more open world, except that awful design gets exposed each time.
Why is it so absurd? You make the same assumption as someone else, more story is automatically equated with being a good thing, to me it sounds like more neediness and ennui from people who aren't me and thus detract from the power of the fantasy as directed towards me.
I'll agree that is weird to focus on BG1, in general, that's actually an annoyance of mine like it was a paragon of something, it was the beginning, and it was good at creating some pretty powerful experiences.
As far as characterization though even though it's just dribs and drabs Imoen was more entertaining than... really a lot of characters not just in Bioware games but in media generally.
I mean honestly to have a character force their way into your party? That's heresy by the modern "you can come and go at any time" standards we see in games.
I'll say one more time you may be conflating me with someone who just wants to promote BG as a way to distance myself from all the other gamers who eat up DA but also eat up DA as like an elitist check, but that's just not it, otherwise I would be saying it's the greatest game ever which I'm not, instead, I'm just saying it's a pretty good experience and had a more immersive and compelling atmosphere than later ones.
Besides can't I play this game in reverse? NWN was still pretty interesting and compelling, and even DA was too, by collapsing the differences between them I'm actually supporting Bioware games more than you are, they made a large number of quality experiences, all I'm saying is the trend is downwards, objectively.
That literally doesn't even matter by the way for all kinds of things, Bioware games, at the beginning or end of their experience, are still undervalued and underappreciated relative to most games, ergo they could make something less compelling than DA and ME and it would still be a relatively worthy experience compared to the gaming environment generally.