In its current stage still feels incomplete. I'm not complaing, I'm really impressed of the work od Drupal Developers. But, personally, as a Drupal user, I miss such small things, that I will have to setup by self with help of external modules:
-- features of BetterFormats (the most)
-- some small ThemeAPI improvements, like overriding "submitted by" message within the template.php. This is especially useful when you want to create a theme containing only css file and template.php file -- yes, it is possible to create such theme, but you cannot override "submitted stuff" (maybe I will create or search for a module or sth)
There are of course, as of alpha stage, many minor things to improve. But as for now, new Drupal major release will be a huge step forward in cms world. Well, right now, after clean and standard installation of D7, the only thing I have to do is to install Views, Markdown and Colorbox modules. Do you feel the difference? (tip: in D6: Views, CCK, Imagefield, Imagecache, Markdown, Colorbox, Contact etc.)
And I have some small D8 list...
-- BetterFormats fully in core
-- NodeHierarchy2 instead of Book
-- Blog/Forum turned into content types integrated with Views
-- Yes, Views in core.
At beta-1 stage, I'm really impressed -- it is a huge improvement in webdevel/admin :D