These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Is Louis so tortured because, deep down, he still believes in human morality but is forced by his vampire nature to live at odds with it, or is he so self centered that all he can see is his own pain?
Canon Sue: Dora, Mona, Merrick, but Lestat most of all.
This is debatable, since Lestat has a lot of realistic flaws and short comings that he himself admits to, does a lot of things that he later regrets and admits to being wrong about (Claudia anyone?) and there are plenty of other characters in the story who really dislike him for what could be considered perfectly logical reasons but are not made out to be villains.
Though, Anne Rice has openly admitted ot Lestat being an Author Avatar (atleast later on in the series) the writing suggests that the reader is meant to empathize with him, but not necessarily approve of everything he does.
Fanon: Though it is a common and long held assumption, the books never actually say that vampires are impotent. In the series people do seem to lose interest in sex following becoming a vampire, but it is never expressly stated or shown that they are INCAPABLE of having sex.
In Interview with the Vampire Louis at one point says something to the effect of "don't get me wrong, Armand was a beautiful man and intimacy with him would not have been unpleasant but, for vampires, the apex of physical pleasure is the kill" this seems to indicate that vampires can have sex, but that sex just isn't as big of a deal to them as it is to humans.
Actually, Lestat states that vampires cannot procreate and outright says in his book Queen Of The Damned that this particular part of human anatomy is completely useless to them.
Hoyay: Stomps all over the line between subtext and text; the only thing that precludes the many intense romances between male vampires from being canonically sexual is the fact that the transformation from humanity renders sex obsolete, as killing becomes the height of achievable pleasure. However, that doesn't stop the pairings from being deeply romantic and erotic.
Jumped the Shark: It is not uncommon to hear people argue for anything after "Queen of the Damned" as having Jumped the Shark. For those that argue for later points of shark-jumping, even the most hardcore series fans were put off by the series after it started incorporating elements from Rice's Mayfair Witches series.
Magnificent Bastard: Lestat, predominantly. Marius, Armand, Akasha and Marahet qualify as well.