Since no one even dies, much less in any grotesque way, it's as far from disturbing as you can get. In fact, it was pretty routine, all considered. As for the comment that it was like watching a FPS, it was a pretty crappy one. Hell, I wish Doom were that easy.
I don't think it's a big deal that footage like this is published, for a few reasons. 1) Not rated R. 2) People should monitor themselves and their children online anyway. 3) It's life, not some video made with the purpose of spilling lots of fake blood.
I've actually seen footage recovered from an Iraqi where his friend attempted to hit a UN APC with an RPG, forgetting that the projectile corkscrews, resulting in both of them getting liquified. If you slow it down, you can see the guy turning to goo, but no one said it was a big deal and the US soldier that recovered it, youtubed it.
I also support the use of headcams like this. I think that if all soldiers had monitoring equipment like they had in 'Aliens', I think monitoring ops from afar would be far more effective. I support it all.
