My only complaint: the click-ad-for-xp quest is a little lame. However, I'm of the opinion that if it bothers you too much, just don't do it. And no one is forcing you to get more xp.
Yah, I'm seeing 404s on achievement pages as well. I'd say I'm VERY DISAPPOINTED but a) giant bomb is awesome and I can accept some occasional bugs and b) I really should be doing actual work.
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