D.Gray-Man is, in my opinion, definitely worth watching. Although unfortunately the remaining episodes of 51 onwards have yet to be dubbed it is still fun to watch with good action and humor. The characters are great, each with their own personalities, so they are easy to get attached to. The storyline is interesting as well. There are a some episodes that weren't based on the manga but it is still worth watching and a good way to spend your time. Something i'd recommend for a good show.
