I watched the first season anime adaptation and was really interested in the story but didn't want to wait for a year for the second season, so I decided to read the manga. Flew threw the main story (I would say ~300 chapters) in one sitting. I was hooked.
It's probably been a little over a year since I began reading, and the chapters that are being released now are just complete trash. There are too many characters to keep track of, so I don't keep track of them and just read on, even if I don't understand a particular gag. There's no more plot. It's just a bunch of side stories that have no purpose. I wish Oda Tomohito could have ended the series when it needed to be ended, not just endlessly and pointlessly continue it.
I would definitely recommend it up to a certain point, but stop when the core story has concluded.