As long as you can turn it off.
Some people are playing as a sport and don't want to be reminded of gory violence thats part of war, JUST like they don't want to be reminded of the social ideology of WWII Germany.
I can see how some people who've seen combat might not like the gore. Fact is, sometimes the first clue you have that you've been shot is wondering "where the hell is all this blood comming from?" Having blood spatters suddenly appear on the screen might be just a little uncomfortably realistic to some, even in a sim.
I think the use of blood spatters is pandering to the Doom crowd, but if you can turn it off - I don't care.