I loved unit 3/4 Lit, was fun. My teacher asked for our interpretations as a class and pointed us towards certain interpretations instead of saying "this is what it is".
While a teacher shouldn't mark you down for not agreeing with them, that's not to say they can't- albeit unethically. Agreeing with them in SACs is of course a safer option, because if you can present it properly it'll probably show them that you have a good understanding of their view, which they most likely believe is right. And not all schools cross-mark SACs: my school only had one lit teacher.
I have to go back on when I considered lit as bullshitting; I don't see it to be much different from a text response in english. You're drawing meaning from the text and analyse it and present a view, and state what the author was trying to achieve. I think it's just because you have more freedom in literature.