At least in Modern Warfare, you have advanced medical equipment to repair broken bones, gunshot wounds and the like, of course that can be counterbalanced with the fact that NBC {Nuclear, Bio and Chemical} weapons are much more available, not to mention the tanks, guns, etc. that have are far more destructive than anything in the past could ever imagine.
With that said, Medieval Warfare was probably the worst type of warfare in history, partly because much of the combat was hand to hand, and people's guts were spilling out, heads and limbs were hacked off at a frequent pace, and even a minor wound could be deadly because there were little in terms of treatment, other than bandages or leeches.
Of course, you could say that much about any war, {particularly in the U.S. Civil War} but with so much advancements in war and in the medical field over the last 500 years or so, it's a far different deal to get injured in 1500 compared to 2011.