All series go downhill in the story... that what make the bipolar turn straight up into the sky when the author finally stop writing to prolong the series.. ie bleach and naruto... which i still read because of habit... getting long winded with new arc and crappier enemies.
I just read the entire manga last week, its sooooo good. Chapter 53 was released today. The wait for 54 is going to be brutal, i feel bad for the people who read it before the hiatus.