This would be great for FPS'ers to. I hope maybe down the line you could actually move around yourself and be your own entity with stuff, instead of getting a type of "TV" Simulation.
I actually enjoy spectating sometimes. I'll admit there have been times when i've come home from the bar or something and discover that I'm in no condition to contribute to the success of my team, but I still get a kick out of watching a couple of beach invasions or whatever.