Hellsing was my first manga and actually it was the fact I started reading more of them. There is everything you can expect from an bloody-vampire-action-gore manga like this. After just a quick glance at the front of the book, you know it's going to be good. Alucard is the most badass vampire you can find in the modern literature. I wasn't bored for a single page and, after finishing one volume, I couldn't wait for another volume to come out. Overall, if you want some fast action and nice plot, choose Hellsing.