an intro seems to me, to at least be slightly generic at least. there's not that much you can really do to make it sound outstandingly different, no book i've read has that many different elements that so many students in the state can write something substantially different from each other.
for example, while doing Poe there seem to be 3 main ideas from the prompts regarding characters which involve obsession, fear and insanity. how much variation is there in terms of saying "Poe explores insanity in his short stories?"
in your intro I would advise you to make sure that you've related it to the prompt, and that it introduces your contention/ point of view that you'll discuss in your piece. provided you do that, and word it coherently so it flows, I don't really see how you can go wrong.
you can of course, change around the structure of your intro a little, for example, instead of starting with "X's novel" you put that later in your introduction, perhaps around the mid point? it's a superficial change, but it may appear slightly different.
just introduce your points, and perhaps have a generic statement you can make about the text, after all, it may be mediocre, but it provides a jumping off point just in case you do get stuck. Not being an assessor I don't know how this would be received, but i'm sure it's not all they'd assess you on