How to find science fiction that isn't shit ? I'll

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How to find science fiction that isn't shit ?

I'll try to explain specifically what turned me off in the few books of the genre I read since about a year, please give me some books that aboid these perceived flaws and discuss

>Rendez-vous with rama
My favourite of the bunch but the dialogs are really B-grade and are full of humorous bits that really don't fit in with the narrative, also the characters are really bland and are basically heroes without flaws that just do anything when convenient. Also I didn't really liked the progression of the ships exploration, it was like people advancing in a jungle tediously with an intrigue that would have been better suited to a crime novel which distracted from the mysterious nature of the ship they are exploring

>Canticle for Leibowitz
Plain boring and quite badly written (even though I read a translation so I can't be really assertive), even though the themes of the book looked promising

>Schild's Ladder
This read like a textbook with really little room for intrigue and characters, most of the actual action is protag discussing matters to agree on what they can do then the author describes the scientific advance that magically comes to advances the plot

I read Foundation some time ago which I really liked even though it's probably more of a space opera. I couldn't finish even the first Dune as I was disappointed by the tedious worldbuilding. I enjoy the poetic material by Lovecraft, I enjoyed American Gods and some stuff that is sometimes labeled as literary sci-fi (The Glass Bead Game by Hesse and The Glass Bees) but I don't think that those could actually be called scifi. So I guess what I want is hard scifi that doesn't sound too pedagogical and can actually build compelling characters that are not just convenient shells just there as a device for the author to explain his pet theoremas ? Anyway recommend me stuff I guess