As much as a devoted fan as I am, I'm not going to sit here and defend it. The truth is, they fix bugs constantly, I'm seeing lots of fixes (I'm a PTS tester, have been for a long time)... but everytime they fix 5, 10 more break.
I'm not going to say I'm not worried about the impression it's making on the masses.
What I will say, is that the game is (generally) in completely playable condition. Me, and many others have hit level 50 on the PTS, and have played the game in it's fullness, and are happy.
I honestly cannot answer why the weekend beta's are so... bad. I'm playing the PTS this weekend, and honestly haven't found but one single bugged quest. Alot of the quests bugged on the weekend server, are working perfectly on the PTS... I just got an alt through Daughter of Giants a few hours ago.