I didn't say better, I said different. I still say that individual writer's and painters for that manner should improve as they advance their technique or craft don't you?
What makes a game good? What a loaded question that is. My pat and boring answer that is true nonetheless for me is one that keeps me entertained, challenges me, and delights the senses. Also comparing games is difficult, nostalgia is a huge factor. Even though BG is a great game how can it not be improved, the writing sure can, graphics, shallow NPC's, dungeons and pathfinding are horrific. Now the music, rule set, art direction is really what remains and that that will be left up to the individual to judge if it has improved at all. Just try to keep nostalgia out of it, which admittedly is difficult to do.