This is nothing. Considering how much of the game they have added or changed on whim requests from the community a small downtime resulting from a major update shouldn't be all that OMG. Nothing but time here anyways.
While I too am frustrated by a weekends loss of "no life" and actually having to spend my time constructively its worth noting that every time Blizz brings out a major patch for WOW the game goes unstable for hours/days while they iron out all the newly introduced "features" (or bugs if you prefer).
I'm still prepared to give Cryptic some space to iron out the game, it's pretty good when its working. Hopefully they'll try to avoid borking the game completely during future updates :p