I wrote earlier that I didn't use my PJ that much for single person playing and used a 42 inch HDTV because I'm about 4-5 foot away from screen. Now on my 42inch HDTV that is fine. But on my PJ it's too close. So for some of us, the place we game might not allow us to move far enough away to enjoy the experience.
Split screen for gaming on PJ is the only way I will play now, since on 42 inch screen the split screens are so small.
Now if I gamed in bigger room, then I probably would use the PJ more often for gaming, so I could be further away from screen. Also, with my 42inch HDTV, I switch between PC mode and gaming mode in PIP, and I can turn on and off the 360 without worrying about lamp life. Every time you turn on the PJ it cuts 2-4 hours off bulb life. So I like to be flexible with gaming, a few minutes here and there, switching between PC and 360 using PIP a few times a day.
I'm thinking of getting LED projector that I might use for 60 inch screen for PC and gaming, short throw, with 20,000 hours life. I'm researching it now. Maybe people posting can also share what PJ they are using for gaming and viewing distance.