Mockingbird is more complex, but what about the killing of Curley's wife in OMAM? She's all pretty and she wears make-up and leads him on and ends up 'petted to death' like the poor old rabbits. And then simple Lennie has to be shot so he doesn't mess up the 'live offa the fatta the lan'' dream.
I personally think it's a crap book, and it does more harm re. rape myths than Mockingbird. It's also short and clunky. I remember dd having to point out all the 'foreshadowing', which is done in an incredibly hamfisted and boring way.
More than all of this, though, I dislike the way that English Lit is taught in school with endless emphasis on 'what does it make the reader feel' and a bit of 'historical context' such as 'in that time it was incredibly sexist and it would have been frowned upon for a woman to marry for love/offer an opinion' for your AOBs. Blerk. Loathe Gove, but there's definitely room for improvement here.