The old 'What videogames made you cry' question.

[Gregorius]

I didn't think Diablo 1's ending was disappointing, it was quite good and gave me a sense of completion...

And ya... who did not shed a tear when that misguided Grom fell to his grave? Just like when Simba's father dies.
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They cited the fact that the cinematic is very ambiguous as to which character has just defeated Diablo. Personally I agree that the ending was excellent in terms of closure and story.
edit: Here's the link:
http://www.gamespot.com/features/tenspot_badendings/
Enjoy...