It isn’t the size that matters, it is the ratio of size to sitting distance. My 24″ monitor from 15 inches is pretty dang big. It fills 50% of my view. It fills more of my view than the 65 from 11 feet.
For the slow paced FPS games I play, bigger is better. Often times I’m shooting at something only a few pixels big. And I’m pretty dang good at hitting those few pixels with a bolt action rifle. You don’t know how to aim until you’ve only got one shot every 2 seconds.
