There's plenty of plot tough, it just kinda ends up with Saitama finishing the super tough opennent in the end, it gets way better after Boros's arc.

The original image was just Naruto, Bleach and One Piece.

Naruto, Bleach and One Piece were for a long time considered "The Big Three" of Shonen, due to their, at the time, popularity. DragonBall was long finished and Jojo was still niche at the time, hence why it is just these three

Since then Naruto ended and Bleach went to hell, so it's hard to see now why these three are always compared unless you were there for the Big Three days.