I don't (necessarily) mind even chapter-by-chapter alteration; the type I hate with a passion is when it's scene-by-scene, so a single chapter contains lots of different people doing different things. Except even as I say that, I remember that Stella Gibbons does this and I like it when she does, so maybe when it's done well (for some value of well) I don't mind it. But I think of it as something I hate, and I have put down many huge F&SF novels because they were switching POVs too much, often with an annoying sentence at the end of every person's scene, like "She only hoped her plan would succeed." or "He knew that it might not work, but he had to try."

I have no idea if I'm getting across the type of thing I mean, but hiss, spit!