So no need to duplicate this except to write that gaming is unlikely on the Inspiron 15. You didn't reveal which model of the 15 so let's pick on one with a GPU.

This GPU shows gaming running but all are at low or medium settings. The person that wanted to game might be stressed as they may not know how to set these up to play on low settings.

I'm going with no, the Inspiron is not a good choice for gaming. It should be fine for web and video play.