I am a seasoned gamer, first time MMO'er, I purchased World of Warcraft on the first day and have been playing ever since. Yes, I have been affected by the issues they've been experiencing, but its not as bad as people complain about. Note that I've had my game rollback 2 hours, I've sat in a queue for an hour, and I've fought through lag. Am I going to unsubscribe, complain to Blizzard, or cry and moan that I cannot play? Nah.
In a few months time (perhaps even sooner) you will notice that these issues will be ironed out and Blizzard will be more than happy to compensate its subscribers.
Besides, if these problems are causing you grief, don't play right now. I'm sure you've got some vacation time you're just itching to waste.