The biggest flaws of this series in my opinon are the bad pacing, mediocre action, very one note characters and the fact that theres very little substance in this manga.
If you read this manga you will probably enjoy it and move on, there's nothing that will make you want to go back and read again or think about the series in depth which is unfortunate.
To be positive the series can be quite funny and certain characters (Inosuke) are very enjoyable to read about.
There are many problems like the pacing action and consistancy issues that I think can be fixed with the anime adaptation which I hope will happen.

Overall its a 7/10, it does not deserve nearly the amount of praise it gets but its still reasonably enjoyable.
Don't set your expectations too high if you plan on reading.