Your rig is actually great for gaming. I'm not much of an Intel fan myself, but your i5 CPU is fast, reliable and performs well. I also had no idea that ASUS has a sister-company that manufactures graphics cards, however the GTX 970 is a solid card. You have good RAM, and an effective power supply to provide a steady flow of juice to all your components. I don't know what brand your HDD is, but the only upgrade I would recommend is a solid state drive. It reads/writes data and much faster speeds, and your mechanical drive, being it is mechanical, is bound to fail soon. Not to mention the technology is being phased out, if not already.
The easiest way to answer this question is to run Star Wars Battlefront, set it to high or ultra settings under graphics, and fire away! If you don't experience frame-drops separate from client-end lag, (in layman's terms the games servers not your computer) then you're good to go!