I've been reading Gantz for the past 2.5-3 years and finally on aug 9 2013, a week after my birthday, I've completed reading this amazing series. I've at least read the first 200 chapters three times over and I still love it just as much as the first time going through. My biggest take from the manga is the character development. I feel like I grew onto the characters. Each character, good or bad, has their own distinct features that make a lasting impression and make me feel like I'm reading an original masterpiece. As soon as you cling on to a character and you appreciatewho they are, suddenly they die or another plot twist takes you down the roller-coaster, taking you up and down, rising climax after one another almost like a rush. I want more, to the point that I catch myself reading consecutive chapters until I become too tired to go on. THAT is what I rate as a 10 manga.

The only downside to such a long series, like many other long series, is consistency. The story has multiple arcs, each with its own lil theme but the arcs don't tie into each other very well. It's not like One Piece where it's well thought out from the beginning and EVERYTHING is meticulously placed giving you hints from the beginning to future events. It's barely a complaint in my opinion, no series is perfectly great. Even One Piece has its flaws considering it's a benchmark of story-line lineage.