Ok OP I'll lay it out for you.
The Anime is filled with lots of low quality animation, the kind you expect from Naruto and Bleach. About 50% of the episodes are filler, which also suck quite badly. Like all of season 2 was filler(which I never watched). And season 1 had like 8 filler episodes.
The only episode with good animation was around 68-70 I forgot.
I'm a casual watcher of DGM cuz I read the manga, and honestly the anime is riddled with shit.
The openings are quite cool however.