That this novel is told through Louis's point of view definitely has a lot to do with how the reader views him and the other vampire characters. This was the first instance, for any of the novels that we've read, in which I have actually felt compassion for one of the vampires. Louis's tale is a sad one...first he must cope with the loss of his humanity, then with the monstrous child he's created, and finally with the loss of Claudia. Not only must he cope with all of these things, but he must cope with them for eternity.
Seeing things from Louis's point of view probably does skew the reader's view of Lestat though... It is hard to imagine that Lestat could have some redeeming quality but maybe if we saw things through his eyes..? That's a big maybe.
We also see Claudia through Louis's perspective. Even though Claudia is sort of a little monster baby, the reader (or at least I) still liked her. I think this has all to do with us seeing her through Louis's eyes. Louis loves her and looks over her lack of respect for human life because she is his "daughter". "And there was so much pleasure in caring for her," Louis says. In the same paragraph however he expresses his concern, "She was simply unlike Lestat and me to such an extent I couldn't comprehend her; for little child she was, but also fierce killer now capable of the ruthless pursuit of blood with all a child's demanding."