I've actually found that playing with most of the settings set to low gives you more of an advantage because you don't have to contend with shadows/confusing textures etc.
Something like:
Draw distance 100%
Effects - Medium (you need this on to be able to see the artillery strikes properly)
Dynamic Shadows - Low (you get to see shadows cast by solid objects, but don't get distracted by hundreds of them)
Vector Calculations (Ultra Settings) - Just for accuracy when you shoot
Other settings - Medium/low depending on how pretty you like the game
I did this because I found the inside of buildings too dark and kept getting shot when I went into them. Turn the settings down as described above, and you get to see everyone