It's a given that the gore runs the entire series, and no, i couldn't make it all the way through, I ran out of money. Although I've heard it has a decent ending. Hellsing I've Read/seen all of, and I liked Walter And it is good with the Action. Yami No Matsui also has more adult themes, but isn't action oriented. Don't get me wrong, it's there, it's just not the focus of the manga.
There's rape there as well. But it's deffinatley not as strong. Plus it got cencored in the translation. Bit bloody too, but a very good read.