ultra-low for me.
I never paid attention. What is the default setting UT comes with. It seems good. I turn it down on my boy's PC and turn off the mature taunts. I leave my PC with the default settings.
I thought I played with ultra low settings. But looking at the Bio-Masacre pic I posted, will have to check settings. But then again, gibs flying through the air is very satisfying.
I use normal.
Low seems a bit too hard to see a hit with those little green puffs.
With the red splats, you know you hit your opponent. :-/ ;)