Graphics don't really mean much. Gameplay is what it's about. Doom 2 has some nasty graphics compared to today, but it's still my most favorite game ever created. Not a lot of games are free either. Maybe except some website based games, and "abandon-ware" (games that have been "abandoned" in the 90's and is free to download, such as SimAnt or some-such). I don't know of any FPS games that are free.