Oh I love Thomas Hardy (I'm from Dorset and I love reading about Wessex!)
I also hated the Goldfinch - in fact I remember posting on Facebook (something I do very very rarely) asking my friends if it was worth persevering, as I found it so heavy-going. I didn't find it boring, but I found the subject-matter really upsetting. (I don't want to post any spoilers!). I loved the Secret History though.
I love 18th & 19th century literature generally, but some novels I haven't been able to finish are:
Wuthering Heights .... depressing
Middlemarch .... just soooo boooooooring
Crime and Punishment .... omg sooooooooooooo boring
Nicholas Nickleby - just so sad, I love Dickens but Dotheboys Hall is a step too far for me
Moden novels:
The Essex Serpent. I did finish it but that was because I honestly thought that it would turn itself around and redeem itself with an amazing ending. Boy was I disappointed. It was recommended to me by so many people, and it was sooo disappointing.
I can't remember which Philip Roth book I ploughed through almost to the end (something about a bloke with a prostate problem and a US election) but oh my god what a self-important writer he is, and what a misogynist. Urgh.
DH cannot get through Birdsong. He's currently on his fourth attempt. It's one of my favourite books of all time!