I'm a third of the way through The Instructions (1030 pages total).
To me it's a fascinating novel.
Obviously some will be put off by the length.
Some familiarity with a lot of the Jewish references will help.
Wow, someone came out and said it! I quite liked "Could You Be The One" and bought "Warehouse" on the strength of it, but never got it. Same with Jesus and Mary Chain.
I got it then but now I don't.