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The ending could have had a narrator describing how the plague was halted

Unlike many other games, the plague wasn't important. 3 People suffering, [sarcams] what a tradgedy![/sarcasm]
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how the dwarves and elves made peace

Oh did they ;0)?
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how the duchy recovered from the orc invasion

Well, that will be told in RR :0)
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how the Dark Forest was rid of monsters

Wha?! How could it be rid of monsters? Trolls and bizarre fauna are still there!
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how the merchants of Verdistas recovered

In my game they didn't recover, MWAHAHAHAH!
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how the humans chose someone to replace the possessed Janus

Same thing: It will be told in RR.
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and whether or not our hero's reputation was restored after his great sacrifice at the Council of Seven and his extermination of the Demon of Lies

Of course it was! After all only complete idiots, brainwashed by Janus's court believed those filthy lies!

Ok, I see what you mean. You wanted something like Fallout's and Arcanum's endings: where at the end they sum your deeds. But both Fallout and Arcanum story ended where the player's adventure ended: I mean DD's story is far from being concluded.

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As was, the ending was flat. After days of vicarious adventuring, my only sense of accomplishment from the ending was that my hero had slain the Demon of Lies. I might have been rewarded with a sense of accomplishment for all that I'd done. To continue this adventure I might have been given some inspiration. <img src="/ubbthreads/images/graemlins/riftrunner.gif" alt="" />

Well, the merchants thanked you for help, didn't they? And you've seen [if you spoke to people] that they don't care about your reputation...
Alright, as I said, I agree with you, still I don't think it is neccaissary.
Have a nice day! :0)