You can't judge hardware purely on performance in games. That does not take into account the quality of the parts themselves.
I posted a $1400 system. I could build a system that would perform exactly the same for $1200 or less. I would simply cut back on the parts so as to limit your ability to upgrade in the future.
Instead, I listed a case, MB, and PSU that would easily accommodate a second GTX 670, so you could easily improve gaming performance.
The ONLY parts actually specified on that link are the CPU, GPU, CPU cooling, and HDD. We can't actually say how good it is, but they didn't specify, and that is a very bad sign.