This show is not only the best anime of all time but also probably the best tv show of all time. It has very little weaknesses. Some dialogue here and there aren't that great, characters(not all of them) have some little to no depth, humor is ass as in all of animes. But the pacing, plot twists, action, voice acting is the best there is, show never slows down there is always something happening your always hooked and left wondering what will happen next. Seasons ranked 1. S4(9.5/10) 2.S2(9-9.5/10) 3.S3(9/10) 4.S1(8.5/10)