Try bugs like finder forgetting which apps open which type of file, crashing whenever you copy a folder with a large number of files in it, crashing when you try to simultaneously copy more than one file. How about dashboard sometimes just losing all your widgets and settings after you spent ages setting them up. Spotlight failing to index all your files, locking up in the middle of a search and starting a brand new search if you switch from list view to full view. Mail totally locking up and permantely refusing to send outgoing mail. With many of these bugs, particulary the finder ones, the whole system locks up and you need to restart, apple-option-escape does not respond.
How about corrupting your keychain so your password is lost and you can no longer log in.
Are any of these bugs serious enough to stop a release? Even if all these very serious and very obvious bugs could be fixed in the coming weeks do you really think that is all of the serious bugs found and fixed? If these are the obvious ones i hate to think what will pop up later if they release a final now.