1 - Weird art and drawings, and i mean this in a bad way. Thank god for the 2011 anime.
2 - Too much detail, at least for a shonen, which is good, but some scenes feel like a class where 80% of the info enters through one ear and leaves through the other. I often find myself reading the same scene more than once to grasp everything (not that i always care though, and i don't always feel like i've lost any important info after partially missing those scenes).
3 - Don't really have a third negative point to make Lol Hiatus, maybe...