Watched Cloud Atlas finally, from about 8 years ago and....I think it was terrible? It's surprising because with Tom Hanks, Halle Berry, Hugo Weaving, Susan Sarandon, etc you would think it would be at least ok, but I'm pretty sure it was bad. It's hard for me to tell because I just finished reading the book and that definitely influenced my viewing in good (I understood what was happening) and bad (some of the choices on departing from the book were weird) ways.
But DH hadn't read the book and he was rather lost. I don't see how someone with no background keeps up, or at least can enjoy the first 2/3 of it before they start to get a better feel for what's going on.
Also, the makeup was *hideous*. The "white face" for Halle Berry and Bae Doona were awful. The aging makeup was bad (I think, even if I allow for the intervening years) and the, I guess you'd call it, "asian face"(?) applied to some white actors (primarily trying to, I guess, remove the appearance of the eye-fold?).
Finally, having all the actors play multiple roles felt gimmicky and made me dislike it more.