Yeah, some of the more intense battles do contain blood. But I only recall about 5. Mostly Ginta's and some badguy skirmishes. The manga's here http://mycurry.net/kojika/mar.html incase you're intersted. And you can get everything before that on MSN.
Man, I hated the anime. They took away almost everything I enjoyed about the manga by ading filler bios to the fights, that were as long as the fights themselves to kill time. Chosing the uglies colours imagebable for the badguys, messing up thier character designes. Having some of the poorest animation I've ever seen and using bad, glaringly out of place CGI for the magic arms. Atleats the characters were as funny as ever.
However I watched a later episode and it looked like it not only kept to the manga's pacing (wich I expected it would, because those fights are longer), but the animation was better too. So I assume it gets better when the Zodiac battles start? That's my favourite part, so I just plan on getting that part when it's dubbed and on DVD.
BTW, does Nanashi remind anyone else of Axl Rose? Joker too, but he really looks like Axl, IMO.