Might be a sign you needed to pace yourself better. I loved that arc and I've come to realize Saitama is always going to show up late because that's the gag about how he's an awful hero even if he's the strongest. Yeah we want him to just show up and wreck shit but it'd be boring if he showed up too early. We get a good perspective of your more typical shounen at first, then we get the OP part.
It wasn't so much the story itself it's more like I found the Garo story to be really interesting and consequently didn't find most of the other shit interesting. My favorite non Garo parts were homeless man disintegrating, Sonic, Child Emperor vs Phoenix Man, Suiryu & The Tournament, Black Steel Luster vs the vomit monster guy, and Amai Mask. There was lots of cool foreshadowing. Also liked that they finally introduced Blast during that arc.
Tornado vs Psychos was good too from an action perspective. I hope we get to see more of Psychos. I figured she was dead and was quite surprised to see her alive in the last few chapters.
I also think the King shit is hilarious. I kinda wonder who would win in a fight between King & Mr. Satan. Mr. Satan is obviously too dumb to be intimidated by King but I wonder if King's luck would save him.
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It says right here in Matthew 16:4 "Jesus doth not need a giant Mecha." https://i.imgur.com/dQgC4kv.jpg