They did break their promise but they did it with the honest intention of doing right by their people.
Azura was upset she became an anticipation before her time, it always would have happened but AlmSiVi forced the issue.
Azura had no claim on the Dunmer. She is a Daedra and chose not to participate in Creation, she chose to sit at the sidelines and later she chose to meddle.
The Triune have a more valid claim to their people as at least they are family.
Azura had her time in the sun and should have been content with that, given that she had no real right to it in the first place.
While I think you cant categorise any Daedra (or god for that matter) as evil or good, to me Azura is one of the more malevolent ones.
Meridia is also vainglorious, but at least she is up front about it and about the nature of the deals she makes.
Azura is a bit more seeming one thing while being another to me.
I'm not exactly well-versed in Morrowind lore, what do you mean by "she became an anticipation before her time" and "Tribunal forced the issue"?
Are you saying that "she'll go down eventually, tribunal just sped things up"?
I always think that the problem is more of a personal matter. Azura enjoyed a position as a worshipped god. Tribunal kind of robbed it from her.
Although now that I think about it, only Tribunal knew about what was happening (them challenging Azura), the rest of Chimer didn't knew, did they? I suppose in that way Azura was kind of a jerk, but then again it wouldn't have happened that way had the Tribunal didn't break their promise and challenge Azura. IIRC Azura appeared before them when they're about to use Kagrenac's Tools (or was it after?) and that was the point when they said "we don't need you anymore" and Azura flipped out.