According to ESRB, this game contains: Blood, Violence
Parents should be concerned—it's essentially a recruitment tool they're making you pay for. Is that something you're comfortable with?
Multiplayer gamers can do a lot worse. There aren't a lot of games out there for people who like realistic FPS deathmatching, and this one does a pretty good job of it.
Would-be soldiers looking to get a glimpse of what the soldiering life is like should look elsewhere. They won't find it here.
Deaf and Hard of Hearing gamers should be fine. There are subtitles and onscreen indicators that tell players everything they need to know.