I dunno. Jumping from therapy sessions to a WWII massacre, recounted in horrifying detail, to an afterlife that plays off of the wedding feast at Cana. Rape and terror porn, the horrors of the Holocaust as the vehicle for one person's enlightenment, Freudian RPF (actual Freudian, with Freud) and a hearty helping of woo.
Not that I hated it, because I didn't, but I can't think of any way to translate it into film that wouldn't turn any or all of the above into a whole lot of fail.
Wikipedia says that one of the attempts to film it was by David Lynch working with Isabella Rossellini, and I can kind of just barely see that, if I squint; but even so, it's a very "Yes, indeed, that failure would have been a less ghastly failure than the other failures" squint.
Catcher at least has a nice distinctive narrative voice and a ton of vivid episodes, and Catch-22 has some screamingly comic and horrifying dialogue that would be just fun to hear gifted actors doing. But The White Hotel? I... just... no. I might possibly see Lynch's version, or Guy Maddin's, if such a thing ever came to exist; but even so I'd do it out of obligation. Much good as there is in the novel, there's nothing in it that would make me want to see it as a film.