(meant to respond sooner)
>>5018
if you're going to have extragalactic invaders, you need to handle that with subtlety. otherwise, you end up with the 'alien invasion' trope, which doesn't really fit in a galaxy full of aliens. there's alot wrong with them. their immunity to the Force is a contradiction, they don't fit the overall feel of Star Wars, and they basically take a sledgehammer to the setting and at the wrong time. as I've said, the Yuuzhan Vong feel like the creation of a WH40K fan who hates Star Wars.
>>5022
I won't deny what you've said here (in fact, you could justify Alderaan as 'shock and awe' against terrorists). while the Empire is better than the Republic in many ways, the fact remains, they're supposed to be the antagonist. the OT is about the Rebels triumphing over the Empire, in parallel to the Jedi triumphing over the Sith. even if you believe RotJ had a bad ending, it's not intended to be that at all. if the Yuuzhan Vong happen, that means the galaxy ends up far worse off under a Rebel victory than Imperial (because the Empire could've fought them off much more effectively). the end result is the outcome of the OT being a bad thing in the long run, which subverts the core of Star Wars.
with that said, I'm more than ok with Thrawn, the Imperial Remnant, and conflict continuing. but the Vong are all sorts of wrong.