I remember D. Gray-Man starting great, then getting worse as the series progressed into filler. I've watched 100 episodes and I can say it only picks up around 60 or 70 after the initial hurdle of Episode 40. It's that long a wait for something worthwhile. Still, I liked the anime, obviously shown by how many episodes I actually sat through. It's a shonen, it's not as great as One Piece, but definitely gothic and unique enough to be an individual anime. That being said, some parts are dragged out soooooo very very long over many episodes, but if you persist you should get a lot out of the series. It's a shame they stopped it due to poor viewing figures.