Your PC will probably run GTA V and Battlefront just fine, not on the highest settings though. You will have to turn down most of the settings to maintain a smooth framerate. The GTX 750 ti is a good card, but not one for maxing out games and expecting 60 fps. The only thing I'd change if I were you would be the PSU, since it's not that powerful, but I think it will run just fine for now, although you should upgrade it in the near future. Below are some videos showing the GTX 750 ti running GTA V and Star Wars Battlefront. Do search for more info and benchmarks, for more details.
Do you have this system or are you going to buy it?