I am currently using this computer for gaming and general personal use. Currently with the graphics card I have (which I plan on upgrading to a newer one in the near future) I can run most games at low-mid settings. Though this build may not have a lot of power it has ample room for improvement considering the 750W power supply and for the most part the only thing you can do to make it more powerful is add more RAM and replace the graphics card(s) when needed. Word of warning with the graphics card that caught me off gaurd: it does NOT need its own power from the power supply which I found to be incredibly unusual. Also though it may say it is crossfire ready it does not have ANY crossfire ports on the card so I am assuming that you can upgrade it with aftermarket parts to do so which is very inconvenient. Overall the performance I am getting with every other part is solid but if you can buy 2 extra things: an extra case fan to improve airflow and also an aftermarket CPU fan. The one that comes with the CPU is incredibly loud and can be distracting.
If I were to improve upon this build (just in case you couldn't already tell!) I would get a better graphics card, most likely I would reccommend either the XFX AMD Radeon HD 7750 1GB GDDR5 (http://www.amazon.com/XFX-DisplayPort-PCI-Express-FX775AZNP4-FX-775A-ZNP4/dp/B007Z3T5JC/ref=sr_1_4?ie=UTF8&qid=1407829522&sr=8-4&keywords=Amd+gpu+ddr5) or the HD7770-2GD5 (http://www.amazon.com/GDDR5-technology-Graphics-Cards-HD7770-2GD5/dp/B0088PK040/ref=sr_1_1?ie=UTF8&qid=1407829522&sr=8-1&keywords=Amd+gpu+ddr5)
Hopefully In the future If I do make more builds I will definitely make more smart decisions both budget-wise and with parts.