Joanna Russ’ We Who Are About To... is a better concept than a book. Conceptually, it’s very interesting: A group of people are marooned on an alien planet, and start following the standard SF “survive and colonize” plotline... but can’t make it and all die.
But the actual experience of reading it is frustrating. Reading a book about doomed protagonists is obviously not entirely fun, but it’s made less fun by the narrator being a horribly unpleasant (and arguably evil) person who descends into madness for the last quarter of the book.
This is probably an “important” book in some sense, but I can’t say I’d recommend reading it.