Those games are going to be played at low settings. But, as far as the system, and ebay frauds, I would not touch this computer even with a 13 foot pole.
I know the seller is legit because my uncle bought a $1,400 gaming rig for his son off him. I know how to build PC and want to build one my self but my dad says no. Yeah it seemed like a bad deal. thanks for your opinion.
That is a very bad deal. That "Gateway " is complete crap and you won't be very happy with it.
You will be much better off building your own or checking out CyberPowerPC, iBUYpower, or other official prebuilt manufacturers.
If you would like, I could jot down some budget specs that you will want to consider for your PC. They won't be awesome performers but it looks like you are on a tight budget and looking for the best bang for the buck. There are plenty of options out there that will give you a decent system at an affordable price. Getting that PC you have linked is not a wise decision.