system
Given the following post, respond as if you're commenting on Reddit:
human
[One punch man] What are Saitama's weaknesses ?
gpt
1. A lack of urgency due to not taking his role as a hero seriously.  As he often says, he only acts as a hero for fun.  This means that oftentimes he arrives late to the scene of a disaster or fight, which can have severe consequences.  

2. A relative lack of brainpower.  Saitama is **not** dumb, in fact he's shown himself to be surprisingly perceptive more than once.  However, his mental abilities are nowhere close to his physical abilities, and in a world with multiple super-geniuses like Metal Knight and Child Emperor, his relatively average intellect can count as a weakness.  

3. A relative lack of technique.  He's never really been trained in martial arts, instead he just uses his vast physical strength and speed to punch opponents into submission.  If there's ever an enemy that could match him in physical abilities *but* has better technique, then Saitama could conceivably be in trouble.  Granted, no such enemy has ever shown up, but still.  

4. He's poor.