Volume 11 of One-Punch Man is the most underwhelming installment of this ongoing manga series. I understand that ONE further expands Saitama's world by introducing the realm of martial arts (that turns out to be a separate "group" like the Hero Association) through the martial arts tournament and the Monster Association that has just recently launched simultaneous attacks in multiple cities, but the charming protagonist, Saitama should still be given those sweet, funny moments. Volume 11 doesn't have any of that, save for that very short round in the tournament. 
 This eleventh volume delves more into the character of another Class S hero Metal Bat, a bat-wielding punk hero (reminds me of Yuyu Hakusho's Kuwabara) who is also a very sweet brother to his little sister. Metal Bat sure is interesting, but I feel that his character development is a bit off compared with his peers. 
 Metal Bat sure is interesting an interesting character, but I feel that his character development is a bit off compared with his peers. 
 The book lacks focus, which most of the time centered on Saitama. The world-expanding route the author is taking now is a risk that might lose a significant number of readers, but if done correctly, may ultimately lead to a satisfying arc conclusion.