Blizzard wants to give you money back ... say whoa? Yea, compensation for certain downtime and performance issues since patch 3.0.2—listen to what Nethaera relayed from the offices:

 Blizzard Quote: (Source) 
Nethaera: Since the release of the latest patch, Echoes of Doom, we have gone through a series of optimizations in order to increase overall game performance. We’ve seen steady, stable populations and a flurry of activity and excitement during the Hallow’s End event and the latest rumblings of zombie attacks. It’s been an exciting time for us as we draw closer to the release of our second expansion, Wrath of the Lich King.

We’ve reached a point where we feel we can now accurately evaluate the events since the patch release. Though overall downtime has been minimal, players have experienced latency, inaccessible instances, and general frustrations. We are therefore announcing that we will be issuing compensation to accounts in all realms in the US, Oceanic, and Latin American regions. Accounts that are currently active and in good standing will be credited with an additional three days of game time.

We would like to thank you for your patience during this time and look forward to seeing you in game!

you could get an outstanding wow power leveling service here.