There are hundreds of isekai MCs out there shocked by how easily Karateka-kun dodged the newbie-bullying cliche.
Also we don't know how strong the hero is compared to adventurers. He's obviously stronger than an average person, but so far, he mostly prevailed due to karate training. For example, without grappling skills, he would have been screwed against that knight. We don't know how many skills a typical adventurer has, or if stat growth is dependent on base stats. As in whether someone with a huge natural physique like the barb leader will get more STR and END points per level than a Japanese with a small body like the hero. Besides, I like to think that this author won't play into a cliche like "wow, that weak-looking newbie is actually super-strong!".