Many of those mentioned I absolutely loved - The Secret History probably my favourite book, Wolf Hall, A Gentleman in Moscow, Catch 22, also very much enjoyed Piranesi, Orbital, Milkman.
Despite loving The Secret History however like others I started and didn't finish both The Goldfinch (although DH loves it and is convincing me to try again) and the Little Friend. Also gave up on A Little Life when I found I couldn't tell where I was in the book as it was just one misery after another all in the same tone - had I already read this bit or not?
Didn't finish either the Poisonwood Bible or Demon Copperhead, both by Barbara Kingsolver, not sure why, just ran out of steam, I might give DC another go. Other books I have given up on -The Silent Companions by Laura Purcell, have tried to read it many times, for some reason just can't get through it; Thirteen Stories by Jonathan Sims - love the Magnus Archives, but just finding these stories to be too similar so again I am floundering a bit in "have I read this bit already?"
When I get to the stage I am flicking ahead out of boredom it is generally curtains for the book. But there are books I have failed to finish that I have then started again another time and absolutely loved - Wolf Hall for one. Started it a number of times, trailed off, then one time I picked it up, read it straight through and then read the two sequels straight afterwards.