Is Macbook Air to weak

[DarwinOSX]

Alienware is owned by Dell so good luck with that.

 

[jdavtz]

Hi, is English your first language? If not, a small note to say so might reduce the harshness of some of the replies.

If it is - please try to use some grammar and correct spelling in your sentences. And people don't tend to appreciate being asked to explain things that are easily found on Google.

To try to answer your question:
Yes the MBA will do what you want, and it will play WoW.
More complex games will have to run at lower settings.
Gaming is probably the most challenging thing for a computer. A thin light laptop is never going to be the best option for this. But it's thin and light.