Whats the problem with the XF Multi-Quote? I miss "merge Users". I can't delete Usergrous in XF because I have too much. Edithistory is missing.
XF does not have a multi-quote, you just have the ability to add multiple quotes in a reply. Providing that they're all on the same page, you loose all of them if you switch pages.
And every single one of them takes you to the bottom of the page, in the 'reply' section once clicked. Not the best idea. Good for a single quote, but not really efficient (or good) for multi-quotes.
I hope you don't mean their admin CP hooks system, the code event listeners in XenForo are much better. I'm not missing anything from vBulletin that was part of the core, except perhaps post/user edit history. I do miss some mods (gallery/arcade/etc), but that's no biggie.