(1): Though this is in some part the fault of the manga being drawn in pencil, the characters aren’t drawn in distinct “heavy lines.” The standard theory when creating manga states that one should draw characters with thick, defined lines (heavy lines), and the background with a thin pen such as a mapping pen, causing the characters to stand out from the backgrounds. Drawing the characters and backgrounds with the same quality of line, (often even leaving no space between the two) the characters often seem to get buried in the background.
2: The individual panels are too “complete” as illustrations. This is only true for each singular frame (panel), and there isn’t enough of an attempt to connect one frame to the next, or to guide the reader in following the flow of the manga.