For the price you would pay for the system you linked, I would recommend building yourself or if you know someone that can build for you. Yes the system would run WoW but for the kinda of cash you would spend on this system. You could build something a lot nicer that would blow WoW out the water and any other game you choose to play this year.
Is it a good prebuilt - No, not really, its over done in some areas and under done in others.
Will it run WoW - Yes, wow isn't a hugely demanding game.
Are you open at all to building yourself? This way you can get a great set up for cheaper than prebuilt with better components.
Yes I am open to building one i know someone who can make it for me but i do not know what parts to get to make a nice build for a buget of $1,300 if you could list the parts that you think would be alot better that would be greatly appreciated.