It upholds Lot as someone respected by God.
What I mean is that it doesn't hold him up as a moral example or lesson. That was done in later interpretation.
God sent his angels to save Lot and his family... And he had angels specifically sent TO him. You can't argue this point.
Actually I can, nowhere does the story say that the mission of the angels was to save Lot and his family. When the angels describe their mission, it is this: "We are going to destroy this place. The outcry to Yahweh against its people is so great that he has sent us to destroy it" (19:13). Yahweh similarly says in the previous chapter that they were being sent so Yahweh would know whether the place is as bad as the outcry against it has made it out to be. They are sent on their way to the city before Abraham makes his appeal to Yahweh to relent from his planned destruction. Nor is there any specific promise made to save Lot. Rather it is Lot who happens upon the angels when he was sitting near the city gate (not realizing their divine mission) and invites them to his house, and saves them from assault. Had Lot not been there and the angels spent the night in the square as they had planned, he would not have met them. Thus some early interpreters felt that Lot was saved on account of this deed: "Because of his hospitality and piety, Lot was saved from Sodom" (1 Clement 11:1).