Hey, I'll have a go at these questions too.
1. Overall, how do the novels stack up against either the OT or the PT movies?
Depends on the novel. The theme of this reply is "the books vary greatly." The ones to check out are Timothy Zahn's Thrawn Trilogy (Heir to the Empire, Dark Force Rising and The Last Command). The classic characters are themselves, the new characters are very worthy additions to the Star Wars galaxy, the story is clever, the bad guy is probably the best in Star Wars ever, including the movies.
Aside from that, I'd also recommend the X-Wing books, especially if you want a new set of characters still with a Star Wars feel. After the X-Wing books, check out I, Jedi. It follows the same main character as the first four X-Wings and is the only novel to be set in the first person. The Han Solo trilogy, both of them actually, are both about Han before ANH and, while very different from each other, are good reads.
If you feel like a big series, the New Jedi Order is also worth a look. They're hit and miss, but one book in the latter half of the series,
Traitor, is probably the only Star Wars novel I ever read that felt like a great book, not just a great Star Wars book, if that makes any sense.
2. Are there other novels set between ANH and ESB, or ESB and ROTJ? I've heard there's only that one that I read between ANH and ESB, and that seems like a wasted opportunity.
Yeah, like others have said, I think the only books between ANH and ESB is Splinter of the Mind's Eye, which was written before ESB came out. There are comics too, I think, but it's largely an untapped area of the timeline.
3. Is there a novel series that takes off right where ROTJ left off and if so, what is it?
Most of the whole Bantam era, into the Del-Rey era, does this. Not a continuous series, as you've probably gathered by now, but there is a loose overall chronology.
4. Are Luke, Leia and Han written so that you can recognize them?
Depends on who's writing them. No author gets everything 100% right, and pretty much none of them write Luke very well. Zahn's Thrawn trilogy does the best job, from what I remember. But beyond even the characters, you get authors who get the dog-fights, but not the lightsaber battles; or they get the lighsabers battles, but not the humour; or they get the humour, but don't know how to use the Jedi and their Force abilities...you get the idea.
5. Is Luke the stiff, humorous, oh-so-serious Jedi from ROTJ or do the novelists return some of the qualities that made him so charming - idealism, humility, innocence and boyish enthusiasm (why are those incompatible with being a Jedi!!!)
He's generally stiff and serious, with very little innocence. By and large no one knows how to write Luke. They have even more trouble with his Force abilities, either giving him way too much power and then introducing a reason for him not to use the Force, ala
Heroes always depowering the heroes, or he's way too weak and whiny.
6. Does Leia ever learn to use the Force?
A little bit, though I found the writers seemed more comfortable keeping her as she is in the movies, i.e. handy with a blaster and snarking at Han.
7. Is Leia still a bossy, crabby bitch (please say yes)?
Sometimes she is, sometimes she's as serious and moody as Luke.
8. Are either Luke or Leia ever seriously threatened by going all Dark Side on us (I'd be astonished if this plot twist never came up)?
Already answered, but this is more covered in the comics, specifically Dark Empire, and not the novels...though those comics are referenced in the novels, which I always found confusing as a kid who only got the books.
9. Just out of curiosity - no details, please - do the novels ever depict how Luke, Leia, Han or Chewie die?
Only in the case of one of them, as far as I know.
10. Are there Clone Wars-era novels and are they any good?
I haven't read many, but I hear they're as hit and miss as the post-ROTJ books.
11. If so, is Anakin written like he should have been and not like a whiny little punk?
Dunno, I think most authors avoid Anakin.
12. Are there any novels that don't deal with the Skywalker family and are they still interesting anyway?
As mentioned, the X-Wing books definitely. I think most of the Clone Wars books are about non-Skywalker characters.
Thank you!
You're welcome!