Gantz used to be very intense. You'd be on the edge of your seat every chapter.
For those who follow the manga, think back to the Onion alien. One of my favorite arcs was the buddist statue aliens, where they actually killed one of the 2 main characters. Think about the Vampire arc. Where are the Vampires now? My favorite arc, I cant remember the villains name, but he was killing everybody just by being near them, one of his transformations, was the chick with a million titties. Gantz used to be WTF epic. Now its just a drag. The last 2 chapters were nothing but Kei and Tae screaming for each other. I'll keep reading in hopes that it returns to its original epicness.
For those new to the manga, the first 150 chapters were great.