It's not bad, but that is a pretty slow CPU (1.5GHz) and the GPU isn't great.
Should perform well enough in most games (medium settings)
I don't believe you can upgrade the GPU or CPU in that model (most of the 11" alienwares solder those in).
Though there is conflicting info on the web.
You are getting what you pay for tbh.
If you are happy with it, that's all that matters.