Now to look at the other side of that; Berserk, one of my favorite manga of all time, started off as a fairly mediocre dark fantasy series, and was like that for the first three volumes. It wasn't bad, but it wasn't that good either, and I was about to drop the series, but once the Golden Age arc hit, the series quickly became one of the best character-study/journey of all time that didn't pull any punches when it came to the characters, and their relationships.
Ja! I just dropped Berserk after ending that third volume. Still, i must say my very first one was Faily.
I'll use MHA manga as an example of this; When i picked up the series, and read through the first chapter, it made me interested in it because of its underdog character story, and how impactful the last few panels of the chapter were. It was a series that announced itself to be a interesting with an relatedable main protag. Fast forward to present, and the series is a very predictable shonen that hits pretty much every modern shonen trope ever. It was a series that started off with a high-note, and devolved into a mindless shonen action series.
Good to know. OumaZoo kinda had that very same pace at its end, Kouhei is not that good, but manages to give me some laughs, i think he resembles the style of Takei at Shaman King, don't know why but can't stop comparing them.