It's only too easy to see the "preps" as the good guys and the "goffs" as the bad guys. After all, the "goffs" are all utter jerks and we never see the "preps" do anything to deserve the treatment they get. In particular, the fic wants us to see Britney as the Alpha Bitch and Enoby as the Cool Loser. But who's the one judging the other for how she dresses? Who's the one who sits by and takes the other's abuse without retaliating until the end? Who's the one gets followed around by a large group of friends while the other one always seems to be on her own? The only time Britney does anything bad is towards the end of the story when she breaks Snap, Loopin, and Hargrid out of Azerbaijan and tells Ebony that Voldemort "will, like, totally kill your friends." And Ebony immediately tortures her afterwards.
"Dumblydore". Is he a "poser" just trying to be cool like Ebony thinks? Is he a brilliant ChessmasterObfuscating Stupidity to manipulate Ebony into destroying "Volsemort"? Or is he just an old, senile guy who does things at random?
When Enoby used the Killing Curse at the end, did she aim it at Voldemort or herself?
Why did Dobby run away crying after witnessing Snap and Loopin doing it? Was he simply horrified by stumbling across such a sight? Or was he actually enjoying it and fled in tears out of embarrassment when Evony caught him watching?
Of the fic:
There is some debate on whether My Immortal itself is a brilliant Troll Fic or just a plain terrible fic. The consensus seems to be that it may be the former, as some noticed a pattern in the odd choices of words (such as "come"/"came"), that certain elements of the fic (such as the Lord of the Rings reference) could only show up if the author had read novels above the reading level the spelling suggests, and much more. Nobody really knows, and the lack of updates from the creator (both on the fic and on her whereabouts) adds fuel to the fire.
If you read some of the later chapters, one starts to notice that the writing was getting better. It seems as if Tara was actively trying to improve in some way, and let's be honest, who the hell could keep up a troll fic after their account was hacked? Yes, it is possible that the hack was part of the trolling, but one has to ask why.
Accidental Innuendo: Whether it's actually accidental depends on whether the fic actually is a parody or not, but regular words are occasionally "accidentally" spelled wrong and turned into obscenities, e.g. "Minister of Magic Cornelius Fudge" becomes "Mystery of Magic Cornelia Fuck", "Professor Slughorn" becoming "Professor Slutborn", etc.
This dramatic reading interprets almost every use of the word "come"/"came" this way, which is easy since a character's arrival in a scene is usually signalled with something like "and then Draco came" without any qualifiers.
Ass Pull: Many examples. At one point the characters need to find Draco (who Volfemort has bondage, whatever that means). To solve this, Vampire "has an idea" and teleports them into Voldemort's lair. Enoby whines endlessly about stuff much easier to solve than this, like choosing between Draco and Vampire.
Author's Saving Throw: It's hard to tell but when Tara explains the fact Dumbledor was calling Ebony and Draco "Motherfuckers" because he had "an headache" can be seen as an attempt to this.
If one examines the later chapters, it actually looks like she was making an effort to improve, though, not by much.
Bathos: Intentional or not, the comedy comes from dramatic, serious moments being destroyed by weird spelling errors, Tara's author notes, or a Mood Whiplash. For example, Ebony appears to slit her wrists whenever she's miserable, whenever she's let Draco down, after being complimented by B'loody Mary, or just because.
Big-Lipped Alligator Moment: Well, most of the plot really comes off as this, but Chapter 10 really stands out. The author's notes say it deals with "serious issues"... and it proceeds to be extremely bizarre even by the standards of the rest of the fic, with Enoby shooting Snap and Loopin "a bazillion times" to seemingly no effect, Dumbledore suddenly coming in and shooting them with his wand, and Hagrid declaring his love for Enoby out off nowhere. (which seems to be Retconned out in the next chapter, with it apparently being Cedric instead who did that... or not, or... argh!)
Broken Base: The spectators are split between those who think it's a story written with genuine intent although with less than stellar grasp of the English language, and those who believe it's a masterfully crafted Troll Fic. Just look at any message board discussing the story and the chances are you will see an equal amount of both viewpoints.
Critical Research Failure: Tara admits that she bases some of it on the movies because she hasn't read all of the books. This is a very good way of upsetting people in Harry Potter fandom circles, but everyone's too busy laughing to care.
Crowning Moment of Funny: Many, many, many lines. But a couple that really take the cake: "Snake and Loopin were in da middle of da empty hall, doin it, and Dobby was watching!" and, of course, "WHAT THE HELL ARE YOU DOING YOU MOTHERFUKERS!"
Don't forget the line "Snap was spying on me and he was taking a video tape of me! And Loopin was masticating to it!"
Designated Hero: Ebony often does things far worse than any of the so-called villains of the story. One of the few character traits that actually remains consistent is that she judges your morals by the way you dress.
Designated Villain: Britney doesn't do anything aside from being a "prep". Except in chapter 42 where it's stated by 'Proffessor Trevolry' that Britney freed Snap, Loopin and Hargrid from "Azerbaijan". How or why exactly, Trevolry (and Tara) never goes into.
Oddly enough, Dolores Umbridge, who while stuck up is still treated as a Reasonable Authority Figure who recognizes Voldemort as a threat and prioritizes student wealthfare, as opposed to her monstruous canonic portrayal.
Faux Symbolism: At one point, Ebony and B'loody Mary watch das niteMARE b4 Xmas. Said film is about being yourself and not trying to be someone you don't understand. While it was likely included because it's "goffik", the message ties in well to the preps/posers/goffs conflict.
Offscreen Moment of Awesome: Given the first-person format of the story, we never see exactly how Britney busted Snape and Lupin out of Azkahbian/Azerbaijan/Afghanistan.
Reference Overdosed: Calling the references to the various "goffic" bands mentioned throughout the story "Shout Outs" is pretty much an understatement. Not helped by the fact that they are pretty unsubtle since most of them consist of "[insert character here looked like [insert attractive gothic musician here]" or "[insert song here] was playing".
Romantic Plot Tumor: Most of the plot is focused on a Vampire/Ebony/Draco Love Triangle. Even Voldemort forcing Ebony to kill "Vampire" is treated as though it were simply a complication to all the romantic drama.
Ron the Death Eater: Dumbledore is a poser, Lupin is evil, in a relationship with Snape, and a necrophiliac, Arthur Weasley apparently raped his children, Snape is a prep, a villain, and a pervert, and that's just the characters Tara intended to be evil.
Sequelitis: The original is considered by some to be So Bad, It's Good, but most of the parody sequels are just plain painful. No matter how hard many may try, none can match Ms. Gilesbie's literary... um, achievement.
So Bad, It's Good: The main reason to read it is to laugh your ass off at how terrible it is. Nobody's really sure if this was the intent or not, but it's certainly the result.
A surprising piece of evidence that it was intentional: the constant references to My Chemical Romance. Sure, at first glance, they're about as "goff" as you can get. But they constantly resist the label 'emo', and when you listen to some of their songs, particularly "Teenagers", you can hear that they're criticizing people that claim not to be 'mainstream' but are simply conforming to a different norm; that's exactly what My Immortal does, whether it intended to or not.
Another piece of evidence is the subtle mention of Lord of the Rings characters, who were only mentioned briefly in the novels but never shown in the movies. Being able to know that must highlight the fact that Tara (if that's her real name) must have read the actual literature and it's quite hard if you can barely spell or read your own work.
There's also the fact that she refers to characters, scenes, and objects that were only in the books, or only given names in the books, such as Professor Sinistra (astronomy) and Arithmancy (maths is notably the only real-world subject mentioned), and uses very minor characters from the movies, like Dobby and Fudge, or else characters nobody who writes fanfic like this would actually use (such as Umbridge).
One could make the argument that Tara was simply told about these things by someone else (likely Raven) rather than having read about them herself.
Not to mention that Tara, who can't spell simply words like "clapped" and "seductively" somehow managed to come up with the correct spelling of "Azerbaijan." Or that she somehow managed to mess up what was probably supposed to be "seductively pointing" into "seductively pontificating", with both words spelled correctly.
We All Live in America: The out of character-ness of everyone is even more jarring for British readers, as the fanfic includes decidedly American high school stereotypes, such as a lack of uniform, the prep social group, and 16-year-olds driving their cars to school.
What an Idiot!: Ebony/Enoby, despite being told that Draco and Harry were a couple long before Draco and her had "you-know-what", insists on believing that Draco cheated on her. About a paragraph later she has a "brainstorm" and wonders if Draco and Harry dated before she started dating Draco. Whether this is genuine stupidity on Enoby's part, or the result of Tara forgetting what she just wrote, we may never know.