How can KOTOR's writing have aged poorly when BioWare has been copying it beat for beat, trying (and failing) desperately to recapture the sense of wonder and innocence that game inspired?
For starters, KOTOR has a plot, which is more than you can say for just about every game BioWare has made in the past decade.
BioWare's writing has always been formulaic. But it's gone from being formulaic to bad and formulaic.
I'd argue that their flagrant copy-pasting in regards to story structure has had a retroactive effect. I love KOTOR, but it's clear to me now more than ever that that game doesn't offer much in terms of effective writing, be it character-level stuff or the backbone stuff, like structure.
I'd put most of their output (Jade Empire, the first Dragon Age, all three previous Mass Effects) on the level of KOTOR. And as much as I like those games, the scripts have only ever been kind of okay, and really good in spots.